Preparation of polymerization catalyst activators utilizing indole-modified silica supports

ABSTRACT

A process for polymerizing propylene is provided. The process comprises contacting propylene and optionally one or more monomers with a catalyst system comprising a bis-indenyl Group 4 metallocene compound supported on silica, the silica treated with one or more organoaluminum compounds and one or more heterocyclic compounds, under slurry conditions in the presence of hydrogen at a temperature of about 50° C. to about 160° C. and a pressure of from about 3 MPa to about 5 MPa to provide a catalyst activity of greater than 30,000 pounds of product per pound of catalyst; and then recovering isotactic polypropylene having a melt flow rate of 20 dg/min or less as measured according to ASTM D-1238 at 230° C. and 2.16 kg.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of U.S. application with Ser.No. 10/753,153 filed on Jan. 7, 2004, now U.S. Pat. No. 7,220,695.

This application is also related to U.S. copending application Ser. No.11/220,164 filed on Sep. 6, 2005 which claims benefit of U.S.Provisional Application, Ser. No. 60/617,952 filed on Oct. 12, 2004.

FIELD OF THE INVENTION

The present invention relates to supported catalyst systems. Moreparticularly, the present invention relates to indole modifiedactivators for olefin polymerization.

BACKGROUND OF THE INVENTION

Metallocene catalyst systems for olefin polymerization typically use anactivator (also called a co-catalyst) to generate the active catalyticspecies. In general, there are two catalyst activator families:partially hydrolyzed aluminum alkyl complexes and non-coordinatinganions (NCA's). Some of the more commonly employed partially hydrolyzedaluminum alkyl complexes include alumoxanes, such as methylalumoxane(MAO), for example. NCA-type activators are typically more active thantheir MAO counterparts, but are also quite costly and much moresensitive to poisons. NCA-type activators also cause problems withcatalyst synthesis, handling, storage and reactor operation. MAO-basedsystems are more robust than their NCA-type counterparts, but MAO-basedsystems suffer from high costs of production, specifically, the largeexcess (relative to the amount of metallocene) of MAO used and itslimited shelf life.

Alternative activators for metallocenes and other single-sitepolymerization catalysts have been the subject of numerous researchefforts in recent years. For example, perfluorophenyl aluminum andborane complexes containing one anionic nitrogen-containing group havebeen studied. For example, R. E. Lapointe, G. R. Roof, K. A. Abboud, J.Klosin, J. Am. Chem. Soc. 2000, 122, 9560-9561, and WO 01/23442 A1report the synthesis of (C₆F₅)₃Al(imidazole)[Al(C6F5)3][HNR′R″]. Inaddition, G. Kehr, R. Frohlich, B Wibbeling, G. Erker, Chem. Eur. J.2000, 6, No.2, 258-266 report the synthesis of (N-Pyrrolyl)B(C₆F₅)₂.Supported activators for polymerization catalysts containing a Group 13element and at least one halogenated, nitrogen-containing aromatic groupligand have also been reported. See, for example, U.S. Pat. No.6,147,173 and U.S. Pat. No. 6,211,105.

U.S. Pat. No. 6,703,338 discloses teal treated indole modified silicaused in combination with bis(1,3-methyl,butyl-cyclopentadienyl)zirconiumdimethyl to polymerize ethylene, however does not disclose use oftreated modified supports in combination with bis indenyl group 4metallocene compounds to polymerize propylene to obtain good molecularweights at high yields.

Other references of interest include: US 2003-104928, WO 2003/064433,U.S. Pat. No. 6,489,480, US 2002-038036, WO 2002/102811, U.S. Pat. No.6,414,162, U.S. Pat. No. 6,040,261, U.S. Pat. No. 6,239,062, U.S. Pat.No. 6,376,629, U.S. Pat. No. 6,451,724, JP 2002-069116A, JP2002-0253486A, US 2003-0027950A1, JP 2002-037812A, JP 2002-020415A, JP2002-060411A, JP 2001-316415A, JP 2001-316414A, U.S. Pat. No. 6,531,552,JP 2001-200010A, JP 2001-163909A, JP 2001163908A, WO 2001-30864A1, JP2001-026613A, JP 2001-031720A, JP 2000-198812A, WO 2000/22010A1, JP2000072813A, WO 2000/11044A1, U.S. Pat. No. 6,353,063, U.S. Pat. No.6,376,416, JP 11255816A(1999-09-21), JP 11166012A(1999-06-22), JP11166011A(1999-06-22), U.S. Pat. No. 6,048,817, JP05025214A(1993-02-02), WO 2003/064433A1, WO 2003/0644435A1, U.S. Pat.No. 6,884,748, U.S. Pat. No. 6,894,131, US 2005-0075242, US2004-0236045, US 2005-0182210, U.S. Pat. No. 6,841,501, US 2004-0127348,US 2005-0165183, WO 2004/003031, EP 0 849 292, US 2003-0171211, U.S.Pat. No. 6,395,846, WO 2005/068515, U.S. Pat. No. 6,858,689 and U.S.Pat. No. 6,869,903.

To enhance polymer morphology, metallocene polymerization catalystsoperated in industrial slurry and gas phase processes are typicallyimmobilized on a carrier or a support, such as alumina or silica.Metallocenes are supported to enhance the morphology of the formingpolymeric particles such that the particles achieve a shape and densitythat improve reactor operability and ease of handling. However, thesupported versions of metallocene polymerization catalysts tend to havelower activity as compared to homogeneous counterparts.

There is a need, therefore, for new, catalyst systems to polymerizepropylene to good molecular weights at high catalyst yields, whilepreferably using lower catalyst loadings.

SUMMARY OF THE INVENTION

A process for polymerizing propylene is provided. In at least oneembodiment, propylene and optionally one or more other monomers arecontacted with a catalyst system comprising a bis indenyl group 4metallocene compound supported on silica. The silica is treated with oneor more organoaluminum compounds and one or more heterocyclic compounds.The polymerization then occurs under slurry conditions in the presenceof hydrogen at a temperature of about 50° C. to about 160° C. and apressure of from about 3 MPa to about 20 MPa to provide a catalystactivity of greater than 30,000 pounds (13,607.8 kg) of product perpound (kg) of catalyst. An isotactic polypropylene is then obtainedhaving a melt flow rate of 20 dg/min or less as measured according toASTM D-1238 at 230° C. and 2.16 kg.

DETAILED DESCRIPTION

For purposes of this invention and the claims thereto “activator system”is defined to be a support combined with an organoaluminurn compound anda heterocyclic compound. For purposes of this invention and the claimsthereto “catalyst system” is defined to be an activator system combinedwith a catalyst compound.

An activator system for polyolefin polymerization is provided. In one ormore embodiments, the activator system includes one or more supportmaterials that has been treated with one or more organoaluminumcompounds and contacted with one or more heterocyclic compounds.Preferably, the one or more support materials are treated with the oneor more organoaluminum compounds before being contacted with the one ormore heterocyclic compounds.

Heterocyclic Compound

The one or more heterocyclic compounds can include one or moresubstituted and unsubstituted pyrroles, imidazoles, pyrazoles,pyrrolines, pyrrolidines, purines, carbazoles, and indoles. Preferably,the one or more heterocyclic compounds include one or more heteroatomsselected from Group 15 and 16. The heteroatom(s) can include nitrogen,oxygen and/or sulfur, most preferably nitrogen.

In one or more embodiments, the one or more heterocyclic compounds canbe unsubstituted or substituted with one or a combination of substituentgroups. The substituent groups can also be substituted. Illustrativesubstituents include but are not limited to hydrogen, halogen, alkyl,alkenyl or alkynyl radicals, cycloalkyl radicals, aryl radicals, arylsubstituted alkyl radicals, acyl radicals, aroyl radicals, alkoxyradicals, aryloxy radicals, alkylthio radicals, dialkylamino radicals,alkoxycarbonyl radicals, aryloxycarbonyl radicals, aroylamino radicals,straight, branched or cyclic alkylene radicals, or any combinationthereof. Other illustrative substituents include fluoromethyl,fluoroethyl, difluoroethyl, iodopropyl, bromohexyl or chlorobezylgroups. Preferably, the substituents include, but are not limited to,methyl, ethyl, propyl, butyl, pentyl, hexyl, cyclopentyl, cyclohexyl,benzyl or phenyl groups and the like, including all their isomers, forexample tertiary butyl, isopropyl, and the like.

In a preferred embodiment, one or more positions on the heterocycliccompound are substituted with a halogen atom or a halogen containinggroup, where the halogen is chlorine, bromine or fluorine, preferablybromine or fluorine, most preferably fluorine. Preferably, theheterocyclic compound includes 4 or more ring members and morepreferably 5 or more ring members. In one or more embodiments, thesubstituents are substituted with one or more halogens, particularlyfluorine or bromine, or heteroatoms or the like.

In one specific embodiment, the heterocyclic compound is unsubstituted.In another specific embodiment, one or more positions on theheterocyclic compound are substituted with a halogen atom or a halogenatom containing group, for example, a halogenated aryl group. Preferablythe halogen is chlorine, bromine or fluorine, more preferably fluorineor bromine and even more preferably the halogen is fluorine.

Preferably, the one or more heterocyclic compounds include one or moreindoles. The one or more indoles can be represented by Formula I asfollows:

where each of X2 X3, X4, X5, X6 and X7 may be, independently, selectedfrom hydrogen, halogen (preferably chlorine, bromine or fluorine, morepreferably bromine or fluorine and most preferably fluorine), an alkylgroup, an aryl group, an alkoxide group, an aryloxide group, or an alkylsubstituted aryl group, wherein the groups can be halogenated orpartially halogenated, preferably containing a fluorine atom and/or abromine atom. In one embodiment, the indole is not perhalogenated.

In another embodiment, each of X2 X3, X4, X5, X6 and X7 can be,independently, hydrogen, halogen, an alkyl group, a halogenated orpartially halogenated alkyl group, an aryl group, a halogenated orpartially halogenated aryl group, an aryl substituted alkyl group or ahalogenated or partially halogenated aryl substituted alkyl group.Preferably the halogen is chlorine, bromine, or fluorine, and mostpreferably fluorine. In another embodiment, each of X2 X3, X4, X5, X6and X7 is, independently, hydrogen or halogen, preferably bromine orfluorine, more preferably fluorine. In another embodiment each of X2 X3,X4, X5, X6 and X7 is, independently, an alkyl group, a halogenated orpartially halogenated alkyl group, an aryl group, or a halogenated orpartially halogenated aryl group.

In one or more embodiments above or elsewhere herein, the indole isfluorinated. A preferred fluorinated indole is4,5,6,7-tetrafluoroindole.

Organoaluminum Compound

Illustrative organoaluminum compounds are represented by Formula II asfollows:AlR₃  (Formula II)wherein each R is independently a substituted or unsubstituted alkylgroup and/or a substituted or unsubstituted aryl group. Preferably R isan alkyl group containing 1 to 30 carbon atoms. Preferred R groupsinclude methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl,nonyl, decyl, undecyl, docecyl, aryl, and all isomers thereof.

In another embodiment, the preferred organoaluminum compounds includealkylaluminum compounds and/or alumoxanes. The organoaluminum compoundscan include alkylaluminum compounds where the alkyl is a C₁ to C₄₀linear, branched or cyclic alkyl, preferably a C₁, to C₁₂ linear orbranched alkyl, preferably methyl, ethyl, propyl, butyl, isobutyl,n-butyl, isopentyl, pentyl, hexyl, octyl, nonyl, decyl or dodecyl, evenmore preferably methyl, ethyl, propyl, butyl, isobutyl, n-butyl, orhexyl. Preferred organoaluminum compounds include those represented byFormula III as follows:AlR_(n)Y_(3-n)  (Formula III)where R is a hydrocarbon group having a carbon number of from 1 to 30,preferably 4 to 12, Y is hydrogen, halogen, an alkoxy group or a siloxygroup, and n is 1, 2, or 3. Particularly preferred alkyl aluminumcompounds include: trimethylaluminum, triethylaluminum,triisobutylaluminum, tri-n-hexylaluminum, tri-n-octylaluminum,tri-iso-octylaluminum, triphenylaluminum and combinations thereof.

In another embodiment, the organoaluminum compound comprises one or morealumoxanes which are generally oligomeric compounds containing —Al(R)—O—or —Al(R)₂—O— subunits, where R is an alkyl group, preferably a C₁, toC₄₀ linear, branched or cyclic alkyl, preferably a C₁, to C₁₂ linear orbranched alkyl, preferably methyl, ethyl, propyl, butyl, isobutyl,n-butyl, isopentyl, pentyl, hexyl, octyl, nonyl, decyl or dodecyl, evenmore preferably methyl, ethyl, propyl, butyl, isobutyl, n-butyl, orhexyl. Examples of alumoxanes include methylalumoxane (MAO), modifiedmethylalumoxane (MMAO), ethylalumoxane, isobutylalumoxane,tetraethyldialumoxane and di-isobutylalumoxane. Alumoxanes can beproduced by the hydrolysis of the respective trialkylaluminum compound.MMAO can be produced by the hydrolysis of trimethylaluminum and a highertrialkylaluminum such as triisobutylaluminum. There are a variety ofmethods for preparing alumoxane and modified alumoxanes, non-limitingexamples of which are described in U.S. Pat. Nos. 4,665,208, 4,952,540,5,091,352, 5,206,199, 5,204,419, 4,874,734, 4,924,018, 4,908,463,4,968,827, 5,308,815, 5,329,032, 5,248,801, 5,235,081, 5,157,137,5,103,031, 5,391,793, 5,391,529, 5,693,838, 5,731,253, 5,731,451,5,744,656, 5,847,177, 5,854,166, 5,856,256 and 5,939,346 and Europeanpublications EP-A-0 561 476, EP-B1-0 279 586, EP-A-0 594 218 and EP-B1-0586 665, and PCT publications WO 94/10180 and WO 99/15534, all of whichare fully incorporated herein by reference.

In one or more embodiments above or elsewhere herein, the organoaluminumcompounds include a combination or mixture of two or more organoaluminumcompounds. In one or more embodiments, a mixture of organoaluminumcompounds includes triethylaluminum and less than 5 wt % alumoxane, suchas methylalumoxane (MAO), preferably less than 4 wt %, less than 3 wt %,less than 2 wt %, less than 1 wt %, or less than 0.5 wt %.

Support Materials

Any suitable support or carrier material can be used. The terms“support” or “carrier” as used herein are used interchangeably andinclude any support material, preferably a porous support material,including inorganic or organic support materials. Non-limiting examplesof inorganic support materials include inorganic oxides and inorganicchlorides. Other support materials include resinous support materialssuch as polystyrene, functionalized or crosslinked organic supports,such as polystyrene, divinyl benzene, polyolefins, or polymericcompounds, zeolites, talc, clays, or any other organic or inorganicsupport material and the like, or mixtures thereof. Preferably, thesupport material is porous, for example, talc, silica, inorganic oxidesand inorganic chlorides.

The preferred support materials are inorganic oxides that include thoseGroup 2, 3, 4, 5, 13 or 14 metal oxides. The preferred supports includesilica, fumed silica, alumina (WO 99/60033), silica-alumina and mixturesthereof. Other useful supports include magnesia, titania, zirconia,magnesium chloride (U.S. Pat. No. 5,965,477), montmorillonite (EuropeanPatent EP-B1 0 511 665), phyllosilicate, zeolites, talc, clays (U.S.Pat. No. 6,034,187) and the like. Also, combinations of these supportmaterials may be used, for example, silica-chromium, silica-alumina,silica-titania and the like. Additional support materials may includethose porous acrylic polymers described in EP 0 767 184 B1, which isincorporated herein by reference. Other support materials includenanocomposites as described in PCT WO 99/47598, aerogels as described inWO 99/48605, spherulites as described in U.S. Pat. No. 5,972,510 andpolymeric beads as described in WO 99/50311, which are all hereinincorporated by reference. Another useful support is fumed silicaavailable under the trade name Cabosil™. TS-610, available from CabotCorporation. Fumed silica is typically a silica with particles 7 to 30nanometers in size that has been treated with dimethylsilyldichloridesuch that a majority of the surface hydroxyl groups are capped.

In another embodiment, any of the conventionally known inorganic oxidesupport materials, such as silica, that retain hydroxyl groups afterdehydration treatment methods can be used. Both silica and silicacontaining metal oxide based supports, for example, silica-alumina, arepreferred. Silica particles, gels and glass beads are most typical.

In another embodiment, the support is a polymeric support, includinghydroxyl-functional-group-containing polymeric substrates, butfunctional groups may be any of the primary alkyl amines, secondaryalkyl amines, and others, where the groups are structurally incorporatedin a polymeric chain and capable of a acid-base reaction with the Lewisacid such that a ligand filling one coordination site of the aluminum isprotonated and replaced by the polymer incorporated functionality. See,for example, the functional group containing polymers of U.S. Pat. No.5,288,677.

It is preferred that the support materials have a surface area in therange of from about 10 m²/g to about 700 m²/g, pore volume in the rangeof from about 0.1 to about 4.0 cc/g and average particle size in therange of from about 5 μm to about 500 μm. More preferably, the surfacearea of the support material is in the range of from about 50 m²/g toabout 500 m²/g, pore volume of from about 0.5 to about 3.5 cc/g andaverage particle size of from about 10 μm to about 200 μm. The averagepore size of the carrier is typically in the range of from 10 Angstromsto 1000 Angstroms, preferably 50 Angstroms to about 500 Angstroms, andmost preferably 75 Angstroms to about 350 Angstroms.

In one embodiment, an amount of organoaluminum compound and/orheterocyclic compound is added to the support material in an amount thatis less than four times the pore volume of the support material, morepreferably less than three times, even more preferably less than twotimes; preferred ranges being from 1.1 times to 3.5 times total porevolume of the support and most preferably in the 1.2 to 3 times totalpore volume of the support. In an alternative embodiment, the amount oforganoaluminum compound and/or heterocyclic compound is from greaterthan zero to less than one times the pore volume of the support materialutilized in forming the activator system.

In one embodiment, an amount of catalyst-containing liquid is added tothe activator system in an amount that is less than four times the porevolume of the support material, more preferably less than three times,even more preferably less than two times; preferred ranges being from1.1 times to 3.5 times total pore volume of the support and mostpreferably in the 1.2 to 3 times total pore volume of the support. In analternative embodiment, the amount of catalyst-containing liquid is fromgreater than zero to less than one times the pore volume of the supportmaterial utilized in forming the activator system.

Procedures for measuring the total pore volume of a porous support areknown in the art. Details of one procedure for use herein is discussedin Volume 1, Experimental Methods in Catalytic Research (Academic Press,1968) (specifically see pages 67-96). This preferred procedure involvesthe use of a classical BET apparatus for nitrogen absorption.

Methods of Supportation

In one or more embodiments above or elsewhere herein, the one or moreheterocyclic compounds and one or more organoaluminum compounds arecombined first and then added to the support to provide the activatorsystem. In one or more embodiments above or elsewhere herein, the one ormore heterocyclic compounds are combined with a support that has beentreated with the one or more organoaluminum compounds, such that thesupport has aluminum alkyl groups bonded thereto. Preferably, theactivator system includes of from 1 wt % to about 20 wt % of the one ormore heterocyclic compounds. In one or more embodiments, the weightpercent of the one or more heterocyclic compounds of the activatorsystem ranges from a low of about 1 wt %, 5 wt %, or 10 wt % to a highof about 20 wt %, 30 wt %, or 50 wt %. Preferably, the one or moreheterocyclic compounds comprises one or more indoles.

Preferably, the one or more organoaluminum compounds are added to thesilica in excess to covalently bond to the hydroxyls on the silica(aluminum-oxygen bond). For example, anywhere from 1.0 mmol to 5 mmol ofone or more organoaluminum compounds per gram of silica is preferred. Inone or more embodiments, the ratio (mmol organoaluminum compounds/gsilica) of the one or more organoaluminum compounds to silica is 2:1,2.5:1, 3:1 or 4:1.

In one or more embodiments above or elsewhere herein, the activatorsystems can be used alone or with other activators or methods ofactivation. For example, the activator system can be used in combinationwith non-coordinating anions (NCAs). The term “non-coordinating anion”(NCA) means an anion which either does not coordinate to said cation orwhich is only weakly coordinated to said cation thereby remainingsufficiently labile to be displaced by a neutral Lewis base.

Illustrative NCAs include but are not limited to tri(n-butyl) ammoniumtetrakis (pentafluorophenyl) boron, a trisperfluorophenyl boronmetalloid precursor or a trisperfluoronapthyl boron metalloid precursor,polyhalogenated heteroborane anions, trimethylaluminum,triethylaluminum, triisobutylaluminum, tri-n-hexylaluminum,tri-n-octylaluminum, tris(2,2′,2″-nona-fluorobiphenyl) fluoroaluminate,perchlorates, periodates, iodates and hydrates,(2,2′-bisphenyl-ditrimethylsilicate).4THF and organo-boron-aluminumcompounds, silylium salts anddioctadecylmethylammonium-bis(tris(pentafluorophenyl)borane)-benzimidazolideor combinations thereof. Other useful NCA's include those listed atparagraph [00135] of WO 2004/026921, pg 77-78.

In one or more embodiments, the activator system has less than 5 wt % ofa non-coordinating anion (NCA) based on the total weight of theactivator system. In one or more embodiments, the activator system hasless than 4 wt % of a non-coordinating anion. In one or moreembodiments, the activator system has less than 3 wt % of anon-coordinating anion. In one or more embodiments, the activator systemhas less than 2 wt % of a non-coordinating anion. In one or moreembodiments, the activator system has less than 1 wt % of anon-coordinating anion. In one or more embodiments, the activator systemhas less than 0.5 wt % of a non-coordinating anion. In one or moreembodiments, the activator system does not include a non-coordinatinganion (i.e., is essentially free of NCA). For purposes of this inventionthe combination of the support, organoaluminum compound, andheterocyclic compound is defined to not be an NCA.

One or more catalyst compounds are then added to the activator system toprovide a catalyst system. In one or more embodiments, the catalystsystem comprises about 0.05 wt % to 30 wt % of the one or moreorganoaluminum compounds, about 0.05 to 30 wt % of the one or moreheterocyclic compounds; about 0.05 to 50 wt % of the one or morecatalyst compounds with the sum of all constituents, including thesilica support, totaling 100 wt %. In one or more embodiments, thecatalyst system comprises 1 to 10 wt % aluminum; 1 to 10 wt % zirconium;and 0.01 to 10 wt % nitrogen. In one or more embodiments, the catalystsystem comprises 1 to 10 wt % or 2 to 9 wt % or 2 to 5 wt % aluminum. Inone or more embodiments, the catalyst system comprises 1 to 10 wt % or 2to 9 wt % or 2 to 5 wt % zirconium. In one or more embodiments, thecatalyst system comprises 1 to 10 wt % or 2 to 9 wt % or 2 to 5 wt %nitrogen. In at least one specific embodiment, the catalyst systemcomprises about 3.0 wt % Al; about 0.5 wt % Zr; and about 0.5 wt %nitrogen. In at least one specific embodiment, the catalyst systemcomprises about 2.7 wt % Al; about 0.53 wt % Zr; and about 0.6 wt %nitrogen.

Catalyst Compounds

The activator system can be used with one or more catalyst compoundsincluding one or more bis-indenyl metallocene compounds and structuralor optical or enantiomeric isomers (meso and racemic isomers, forexample see U.S. Pat. No. 5,852,143), thereof, and mixtures thereof. Forexample, the catalyst compound can include one or more bis-indenyl Group4 metallocene compounds, preferably those represented by Formula (III)as follows.Ly(Ind)(Ind*)M^(m)X_(n)  (III)where:

-   Ind is a substituted or unsubstituted indenyl group;-   Ind* is a substituted or unsubstituted indenyl group, which may be    the same or different from Ind;-   L is a bridging group connecting (Ind) to (Ind*);-   y is 0 or 1;-   M is a Group 4 transition metal, (preferably Ti, Hr or Zr,    preferably Hf or Zr);-   m is 3, 4, 5 or 6, preferably 3 or 4, preferably 4;-   X is a halogen or a substituted or unsubstituted hydrocarbyl group,    a substituted or unsubstituted hydrocarboxy group, or a substituted    or unsubstituted heteroatom containing group; and-   n is m minus 2.

In a preferred embodiment, L is represented by the formula: RqSi whereeach R is, independently, a substituted or unsubstituted C₁ to C₂₀hydrocarbyl group and q is 1, 2, 3 or 4, preferably L is SiMe₂ or SiPh₂,where Me is methyl and Ph is phenyl.

For purposes of this invention and the claims thereto:

The term “hydrocarbyl radical” is sometimes used interchangeably with“hydrocarbyl” throughout this document. For purposes of this disclosure,“hydrocarbyl radical” encompasses C₁-C₅₀ radicals. These radicals can belinear, branched, or cyclic including polycyclic. These radicals can besaturated, partially unsaturated or fully unsaturated, and when cyclic,may be aromatic or non-aromatic.

Substituted hydrocarbyl radicals are radicals in which at least onehydrogen atom has been replaced with a heteroatom or with at least onefunctional group such as NR″₂, OR″, PR″₂, SR″, BR″₂, SiR″₃, GeR″₃ andthe like or where at least one non-hydrocarbon atom or group has beeninserted within the hydrocarbyl radical, such as O, S, NR″, PR″, BR″,SiR″₂, GeR″₂, and the like, where R″ is independently a hydrocarbyl orhalocarbyl radical. The functional group can be an organometalloidradical.

Halocarbyl radicals are radicals in which one or more hydrocarbylhydrogen atoms have been substituted with at least one halogen orhalogen-containing group (e.g. F, Cl, Br, I).

Substituted halocarbyl radicals are radicals in which at least onehydrocarbyl hydrogen or halogen atom has been substituted with at leastone functional group such as NR″₂, OR″, PR″₂, SR″, BR″₂, SiR″₃, GeR″₃and the like or where at least one non-carbon atom or group has beeninserted within the halocarbyl radical such as O, S, NR″, PR″, BR″,SiR″₂, GeR″₂, and the like where R″ is independently a hydrocarbyl orhalocarbyl radical provided that at least one halogen atom remains onthe original halocarbyl radical. The functional group can be anorganometalloid radical.

In some embodiments, the hydrocarbyl radical is independently selectedfrom methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl,decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl,heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl,tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl,nonacosyl, triacontyl, ethenyl, propenyl, butenyl, pentenyl, hexenyl,heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl,tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl,nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl,tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl,nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl,heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl,tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl,nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl,tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl,nonacosynyl, or triacontynyl isomers. For this disclosure, when aradical is listed it indicates that radical type and all other radicalsformed when that radical type is subjected to the substitutions definedabove. Alkyl, alkenyl and alkynyl radicals listed include all isomersincluding where appropriate cyclic isomers, for example, butyl includesn-butyl, 2-methylpropyl, 1-methylpropyl, tert-butyl, and cyclobutyl (andanalogous substituted cyclopropyls); pentyl includes n-pentyl,cyclopentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1-ethylpropyl,and neopentyl (and analogous substituted cyclobutyls and cyclopropyls);butenyl includes E and Z forms of 1-butenyl, 2-butenyl, 3-butenyl,1-methyl-1-propenyl, 1-methyl-2-propenyl, 2-methyl-1-propenyl and2-methyl-2-propenyl (and cyclobutenyls and cyclopropenyls). Cycliccompound having substitutions include all isomer forms, for example,methylphenyl would include ortho-methylphenyl, meta-methylphenyl andpara-methylphenyl; dimethylphenyl would include 2,3-dimethylphenyl,2,4-dimethylphenyl, 2,5-dimethylphenyl, 2,6-diphenylmethyl,3,4-dimethylphenyl, and 3,5-dimethylphenyl.

Preferred Ind and Ind* groups include those groups disclosed in Table 1,Column A pages 33-58 of WO 2006/065809. Particularly preferred Ind orInd* groups include methyl-indenyl; methyl,butyl-indenyl;methyl,phenyl-indenyl; 2-methyl-4-phenyl-indenyl;2-methyl4(2,6-di-t-butyl)indenyl; 2-methyl-4-naphthyl-indenyl;2-ethyl-4-phenyl indenyl; 4,5-dihydroindenyl, 4,7-dihydroindenyl,4,5,6,7-tetrahydroindenyl, 2-methyl-7-phenylindeny; and 2-propylindenyl.By substituted indene is meant that a hydrogen on the indene is replacedby a hydrocarbyl group (such as ethyl, methyl, phenyl, naphthyl, benzyl,etc, typically a C1 to C20 hydrocarbyl group) or a heteroatom or thatone of the carbons in the indene rings is replaced by a hetreoatom (suchas nitrogen or phosphorus).

Additional exemplary catalyst compounds useful herein include thosebis-indenyl metallocene compounds represented by the formula:

In the above structure, M1 is selected from titanium, zirconium, orhafnium.

R1 and R2 are identical or different and are selected from hydrogenatoms, C1-C10 alkyl groups, C1-C10 alkoxy groups, C6-C10 aryl groups,C6-C10 aryloxy groups, C2-C10 alkenyl groups, C2-C40 alkenyl groups,C7-C40 arylalkyl groups, C7-C40 alkylaryl groups, C8-C40 arylalkenylgroups, OH groups or halogen atoms; or conjugated dienes that areoptionally substituted with one or more hydrocarbyl,tri(hydrocarbyl)silyl groups or hydrocarbyl,tri(hydrocarbyl)silylhydrocarbyl groups. The conjugated diene cancontain up to 30 atoms not counting hydrogen.

R3 to R12 are the same or different and are selected from hydrogenatoms, halogen atoms, C1-C10 halogenated or unhalogenated alkyl groups,C6-C10 halogenated or unhalogenated aryl groups, C2-C10 halogenated orunhalogenated alkenyl groups, C7-C40 halogenated or unhalogenatedarylalkyl groups, C7-C40 halogenated or unhalogenated alkylaryl groups,C8-C40 halogenated or unhalogenated arylalkenyl groups, —NR′2, —SR′,—OR′, —OSiR″3 or —PR′2 radicals in which R′ is one of a halogen atom, aC1-C10 alkyl group, or a C6-C10 aryl group; or two or more adjacentradicals R5 to R7 together with the atoms connecting them can form oneor more rings.

R13 is selected from

—B(R¹⁴)—, —Al(R¹⁴)—, —Ge—, —Sn—, —O—, —S—, —SO—, —SO₂—, —N(R¹⁴)—, —CO—,—P(R¹⁴)— —P(O)(R¹⁴)—, —B(NR¹⁴R¹⁵)— and —B[N(SiR¹⁴R¹⁵R¹⁶)₂]—. R¹⁴, R¹⁵and R¹⁶ are each independently selected from hydrogen, halogen, C₁-C₂₀alkyl groups, C₆-C₃₀ aryl groups, C₁-C₂₀ alkoxy groups, C₂-C₂₀ alkenylgroups, C₇-C₄₀ arylalkyl groups, C₈-C₄₀ arylalkenyl groups and C₇-C₄₀alkylaryl groups, or R¹⁴ and R¹⁵, together with the atom(s) connectingthem, form a ring; and M³ is selected from carbon, silicon, germaniumand tin.

Alternatively, R13 is represented by the formula:

wherein R¹⁷ to R²⁴ are as defined for R¹ and R², or two or more adjacentradicals R¹⁷ to R²⁴, including R²⁰ and R²¹, together with the atomsconnecting them form one or more rings; M² is carbon, silicon,germanium, or tin.

Preferred catalyst compounds useful herein include:

-   dimethylsiladiyl(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-methyl, 4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium    dichloride;-   dimethylsiladiyl(2-ethyl, 4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium    dichloride;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-butyl, 4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium    dichloride;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-ethyl, 4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium    dichloride;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-methyl, 4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium    dimethyl;-   dimethylsiladiyl(2-ethyl, 4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium    dimethyl;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-ethyl, 4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium    dimethyl;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-methyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂, zirconium dichloride;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂, zirconium dichloride;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂, zirconium dichloride;-   dimethylsiladiyl(2-methyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂, hafnium dichloride;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂, hafnium dichloride;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-methyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-methyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-isobutyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylsiladiyl(2-methyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium    dichloride;-   dimethylsiladiyl(2-ethyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium    dichloride;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-ethyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium    dichloride;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;-   dimethylsiladiyl(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylsiladiyl(2-methyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium    dimethyl;-   dimethylsiladiyl(2-ethyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium    dimethyl;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-ethyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium    dichloride;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;-   dimethylsiladiyl(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylsiladiyl(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   9-silafluorendiyl(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride-   dimethylamidoborane(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-n-butyl, 4-[3′,    5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   dimethylamidoborane(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylanidoborane(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   dimethylamidoborane(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl    dimethylamidoborane(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   dimethylamidoborane(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride-   diisopropylamidoborane(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   diisopropylamidoborane(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   diisopropylamidoborane(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   diisopropylamidoborane(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride    bis(trimethylsilyl)amidoborane(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;-   bis(trimethylsilyl)amidoborane(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl) η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;-   bis(trimethylsilyl)amidoborane(2-methyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-ethyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-n-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-iso-propyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-n-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-iso-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-sec-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-tert-butyl,    4-[3′,5′-di-tbutylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-ethyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-n-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-iso-propyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-n-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-iso-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-sec-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-tert-butyl,    4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-ethyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-n-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl-   bis(trimethylsilyl)amidoborane(2-iso-propyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-n-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-iso-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-sec-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-tert-butyl,    4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-methyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-ethyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-n-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-iso-propyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-n-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-iso-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-sec-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   bis(trimethylsilyl)amidoborane(2-tert-butyl,    4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;-   rac-dimethylsilyl-bis(indenyl)hafniumdimethyl;-   rac-dimethylsilyl-bis(indenyl)hafniumdichloride;-   rac-dimethylsilyl-bis(indenyl)zirconiumdimethyl;-   rac-dimethylsilyl-bis(indenyl)zirconiumdichloride;-   rac-dimethylsilyl-bis(2-methyl-4-phenyl-indenyl)hafniumdimethyl;-   rac-dimethylsilyl-bis(2-methyl-4-phenyl-indenyl)hafniumdichloride;-   rac-dimethylsilyl-bis(2-methyl-4-phenyl-indenyl)zirconiumdimethyl;-   rac-dimethylsilyl-bis(2-methyl-4-phenyl-indenyl)zirconiumdichloride;-   rac-dimethylsilyl-bis(2-methyl-benzindenyl)hafniumdimethyl;-   rac-dimethylsilyl-bis(2-methyl-benzindenyl)hafniumdichloride;-   rac-dimethylsilyl-bis(2-methyl-benzindenyl)zirconiumdimethyl;-   rac-dimethylsilyl-bis(2-methyl-benzindenyl)zirconiumdichloride;-   rac-dimethylsilyl-bis-(2-methyl-indenyl)zirconiumdimethyl;-   rac-dimethylsilyl-bis-(2-methyl-indenyl)hafniumdimethyl;-   rac-dimethylsilyl-bis-(2-methyl-indenyl)hafniumdichloride;-   rac-dimethylsilyl-bis-(2-methyl-indenyl)zirconiumdichloride;-   rac-dimethylsilyl-bis(2-methyl-4-naphthyl-indenyl)hafniumdimethyl;-   rac-dimethylsilyl-bis(2-methyl-4-naphthyl-indenyl)zirconium    dichloride;-   rac-dimethylsilyl-bis(2-methyl-4-naphthyl-indenyl)hafniumdichloride;-   rac-dimethylsilyl-bis(2-methyl-4-naphthyl-indenyl)zirconium    dimethyl;-   rac-ethylene-bis(indenyl)hafniumdimethyl;-   rac-ethylene-bis(indenyl)hafniumdichloride;-   rac-ethylene-bis(indenyl)zirconiumdimethyl;-   rac-ethylene-bis(indenyl)zirconiumdichloride;-   rac-dimethylsilyl-bis(2-methyl-4-(2′-methyl-phenyl)-indenyl)hafnium    dimethyl;-   rac-dimethylsilyl-bis(2-methyl-4-(2′-methyl-phenyl)-indenyl)hafnium    dichloride;-   rac-dimethylsilyl-bis(2-methyl-4-(2′-methyl-phenyl)-indenyl)zirconiumdimethyl;-   rac-dimethylsilyl-bis(2-methyl-4-(2′-methyl-phenyl)-indenyl)zirconium    dichloride;-   rac-dimethylsilyl-bis(2-methyl-4-(4′-methyl-phenyl)-indenyl)hafnium    dimethyl;-   rac-dimethylsilyl-bis(2-methyl-4-(4′-methyl-phenyl)-indenyl)hafnium    dichloride;-   rac-dimethylsilyl-bis(2-methyl-4-(4′-methyl-phenyl)-indenyl)zirconium    dimethyl;-   rac-dimethylsilyl-bis(2-methyl-4-(4′-methyl-phenyl)-indenyl)zirconium    dichloride;-   rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)hafnium    dimethyl;-   rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)hafnium    dichloride-   rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)zirconium    dimethyl;-   rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)zirconium    dichloride;-   rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)hafnium    dimethyl;-   rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)hafnium    dichloride;-   rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)zirconium    dimethyl;-   rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)zirconium    dichloride;-   rac-dimethylsilyl-(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)(2-isopropyl-4-(4′-tert-butyl-phenyl)-indenyl)hafnium    dimethyl;-   rac-dimethylsilyl-(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)(2-isopropyl-4-(4′-tert-butyl-phenyl)-indenyl)hafnium    dichloride;-   rac-dimethylsilyl-(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)(2-isopropyl-4-(4′-tert-butyl-phenyl)-indenyl)zirconium    dichloride;-   rac-dimethylsilyl-(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)(2-isopropyl-4-(4′-tert-butyl-phenyl)-indenyl)zirconiumdimethyl;-   rac-dimethylsilyl-bis(2-methyl-4,6-diisopropyl-indenyl)hafnium    dimethyl;-   rac-dimethylsilyl-bis(2-methyl-4,6-diisopropyl-indenyl)zirconium    dimethyl;-   rac-dimethylsilyl-bis(2-methyl-4,6-diisopropyl-indenyl)zirconium    dichloride; and-   rac-dimethylsilyl-bis(2-methyl-4,6-diisopropyl-indenyl)hafnium    dichloride.

Mixtures of the above compounds can also be used herein preferably twoor more of the above compounds are used herein.

Polymerization Process

The activated systems and catalyst compounds utilizing the activatorsystems are suitable for use in any prepolymerization and/orpolymerization process over a wide range of temperatures and pressures.The temperatures can be in the range of from −60° C. to about 280° C.,preferably from 50° C. to about 200° C. In another embodiment, thepolymerization temperature is above 0° C., above 50° C., above 80° C.,above 100° C., above 150° C. or above 200° C. In another embodiment, thepolymerization temperature is 50° C. to 200° C., or 70° C. to 150° C.,or 75° C. to 125° C. In one embodiment, the pressures employed can be inthe range from 1 atmosphere (0.101 MPa) to about 500 atmospheres (50.663MPa) or higher. In another embodiment, the activated systems andcatalyst compounds utilizing the activator systems are suitable forsupercritical polymerization processes.

Polymerization processes include solution, gas phase, slurry phase and ahigh pressure process or a combination thereof. Particularly preferredis a gas phase or slurry phase polymerization of one or more olefin(s)at least one of which is ethylene or propylene. In one embodiment, theprocess is directed toward a solution, high pressure, bulk, slurry orgas phase polymerization process of one or more olefin monomers havingfrom 2 to 30 carbon atoms, preferably 2 to 12 carbon atoms, and morepreferably 2 to 8 carbon atoms.

Illustrative monomers can include, but are not limited to, one or morelinear, branched or cyclic olefins; linear branched or cyclic alphaolefins; linear, branched or cyclic diolefins; linear branched or cyclicalpha-omega olefins; linear, branched or cyclic polyenes; linearbranched or cyclic alpha olefins. Particularly, preferred monomersinclude one or more of ethylene, propylene, butene-1,pentene-1,4-methyl-pentene-1, hexene-1, octene-1,decene-1,3-methyl-pentene-1, norbornene, norbornadiene,3,5,5-trimethyl-1-hexene, 5-ethyl-1-nonene, vinyl norbornene, andethylidene monomers.

Illustrative cyclic containing monomers useful as comonomers includearomatic-group-containing monomers containing up to 30 carbon atoms andnon aromatic cyclic group containing monomers containing up to 30 carbonatoms. Suitable aromatic-group-containing monomers comprise at least onearomatic structure, preferably from one to three, more preferably aphenyl, indenyl, fluorenyl, or naphthyl moiety. The aromaticgroup-containing monomer further comprises at least one polymerizabledouble bond such that after polymerization, the aromatic structure willbe pendant from the polymer backbone. The aromatic-group containingmonomer may further be substituted with one or more hydrocarbyl groupsincluding but not limited to C₁ to C₁₀ alkyl groups. Additionally, twoadjacent substitutions may be joined to form a ring structure. Preferredaromatic-group-containing monomers contain at least one aromaticstructure appended to a polymerizable olefinic moiety. Particularlypreferred aromatic monomers include styrene, alpha-methylstyrene,para-alkylstyrenes, vinyltoluenes, vinylnaphthalene, allyl benzene, andindene, especially styrene, paramethyl styrene, 4-phenyl-1-butene andallyl benzene. Suitable non-aromatic cyclic group containing monomerspreferably have at least one polymerizable olefinic group that is eitherpendant on the cyclic structure or is part of the cyclic structure. Thecyclic structure may also be further substituted by one or morehydrocarbyl groups such as, but not limited to, C₁ to C₁₀ alkyl groups.Preferred non-aromatic cyclic group containing monomers includevinylcyclohexane, vinylcyclohexene, vinylnorbornene, ethylidenenorbornene, cyclopentadiene, cyclopentene, cyclohexene, cyclobutene,vinyladamantane and the like.

Diolefin monomers useful as comonomers can include any hydrocarbonstructure, preferably C₄ to C₃₀, having at least two unsaturated bonds,wherein at least two of the unsaturated bonds are readily incorporatedinto a polymer by either a stereospecific or a non-stereospecificcatalyst(s). It is further preferred that the diolefin monomers beselected from alpha, omega-diene monomers (i.e., di-vinyl monomers).More preferably, the diolefin monomers are linear di-vinyl monomers,most preferably those containing from 4 to 30 carbon atoms. Examples ofpreferred dienes include butadiene, pentadiene, hexadiene, heptadiene,octadiene, nonadiene, decadiene, undecadiene, dodecadiene, tridecadiene,tetradecadiene, pentadecadiene, hexadecadiene, heptadecadiene,octadecadiene, nonadecadiene, icosadiene, heneicosadiene, docosadiene,tricosadiene, tetracosadiene, pentacosadiene, hexacosadiene,heptacosadiene, octacosadiene, nonacosadiene, triacontadiene,particularly preferred dienes include 1,6-heptadiene, 1,7-octadiene,1,8-nonadiene, 1,9-decadiene, 1,10-undecadiene, 1,11-dodecadiene,1,12-tridecadiene, 1,13-tetradecadiene, and low molecular weightpolybutadienes (Mw less than 1000 g/mol). Preferred cyclic dienesinclude cyclopentadiene, vinylnorbornene, norbornadiene, ethylidenenorbornene, divinylbenzene, dicyclopentadiene or higher ring containingdiolefins with or without substituents at various ring positions.

Illustrative polymers that can be produced according to one or moreembodiments herein include but are not limited to homo- and co-polymersof propylene, including isotactic polypropylene, syndiotacticpolypropylene, random copolymer (RCP), alpha-polypropylene,propylene-ethylene elastomers, ethylene propylene copolymers and thelike. In one or more embodiments, propylene is polymerized with at leasttwo different monomers (often a minor amount of ethylene), optionallyone of which can be a diene, to form a terpolymer.

Propylene based polymers produced herein preferably include isotacticpolypropylene, atactic polypropylene and random, block or impactcopolymers. Preferably, the polymers include homo- and co-polymers ofpropylene, wherein the copolymer contains 1 mol % to 50 mol %(preferably 1 to 25 mole % in some embodiments, and 1 to 10 mole % inother embodiments) of ethylene or a C₄ to C₅₀ olefin, preferably butene,pentene, hexene, octene, nonene, decene, dodecene,3,5,5-trimethyl-1-hexene, and the like.

In a slurry polymerization, a suspension of solid, particulate polymeris formed in a liquid polymerization diluent medium to which ethyleneand monomers and often hydrogen along with catalyst are added. Thesuspension including diluent is intermittently or continuously removedfrom the reactor where the volatile components are separated from thepolymer and recycled, optionally after a distillation, to the reactor.The liquid diluent employed in the polymerization medium is typically analkane having from 3 to 7 carbon atoms, preferably a branched alkane.The medium employed should be liquid under the conditions ofpolymerization and relatively inert. When a propane medium is used theprocess is preferably operated above the reaction diluent criticaltemperature and pressure. Preferably, a hexane or an isobutane medium isemployed.

Typically, a slurry process can be are carried out at any temperatureand pressure range effective in carrying out the polymerization process.In general, temperatures can range from about 20° C. to 160° C. Morespecific ranges include from about 10° C. to 140° C., and morepreferably from about 20° C. to 120° C. Lower temperatures areparticularly preferred to provide an added benefit of forming discreteparticles of the polymer. Preferred lower temperatures include thosetemperatures at which the polymerization is carried out at a temperatureof less than 100° C., more preferably less than 80° C., and mostpreferably less than 60° C. Preferably, the polymerization temperatureis above room temperature (23° C.), preferably above 25° C., preferablyabove 27° C., preferably above 30° C., preferably above 50° C.,preferably above 70° C. Pressures can range from 1 mm Hg (133 Pa) toabout 3500 bar (350 kPa), preferably from 0.5 bar (50 kPa) to about 500bar (50 MPa), more preferably from about 1 bar (100 kPa) to about 100bar (10 MPa), and most preferably from about 5 bar to about 50 bar (5MPa). In one or more embodiments, the pressure can range from a low ofabout 1 MPa, 5 MPa, or 10 MPa to a high of about 20 MPa, 30 MPa or 50MPa.

In one embodiment of the slurry process, the monomers are miscible inthe diluent or diluent mixture, i.e., constitute a single phase, whilethe polymer precipitates from the diluent with good separation from thediluent. In one embodiment, a solvent or co-diluent is added to thereaction process. In a particular embodiment, an alkane having from 3 to7 carbon atoms, preferably a branched alkane, is added. Preferredalkanes include isobutane and isohexane. In other embodiments, propyleneis used as the diluent and the monomer.

A preferred polymerization technique is referred to as particle formpolymerization, which is essentially a slurry process utilizing asupported catalyst wherein the temperature is kept below the temperatureat which the polymer goes into solution. An example of such a techniqueis described in U.S. Pat. No. 3,248,179, which is fully incorporatedherein by reference. Other slurry processes include those employing oneor more of a loop reactor or a stirred tank reactor. A plurality of suchreactors can be used in series, parallel, or combinations thereof.Non-limiting examples of slurry processes include continuous loop orstirred tank processes. Also, other examples of slurry processes aredescribed in U.S. Pat. Nos. 4,613,484 and 5,986,021, which are fullyincorporated herein by reference. Such combinations of stirred slurry,loop slurry, or stirred and loop slurry reactors are useful forproduction of bimodal polymers.

In one embodiment, the reactor used in the slurry process is capable ofproducing greater than 2000 lbs of polymer per hour (907 kg/hr), morepreferably greater than 5000 lbs/hr (2268 kg/hr), and most preferablygreater than 10,000 lbs/hr (4540 kg/hr). In another embodiment, theslurry reactor is capable of producing greater than 15,000 lbs ofpolymer per hour (6804 kg/hr), preferably greater than 25,000 lbs/hr(11,340 kg/hr) to about 100,000 lbs/hr (45,500 kg/hr).

In one embodiment, polymer granules and supported catalyst particles arepresent as solid particles in the slurry reactor, and the slurry diluentis a fluorinated hydrocarbon, one or more hydrocarbons, or mixturesthereof. In one embodiment, the concentration of solid particles in theslurry is equal to or greater than 10 volume %. In another embodiment,the solid particles are present in the slurry at a concentration equalto or greater than 25 volume %. In yet another embodiment, the solidparticles are present in the slurry at a concentration less than orequal to 75 volume %. In yet another embodiment, the solid particles arepresent in the slurry at concentrations ranging from 1 to 70 volume %;from 5 to 70 volume %; from 10 to 70 volume %; from 15 to 70 volume %;from 20 to 70 volume %; from 25 to 70 volume %; from 30 to 70 volume %;or from 40 to 70 volume %.

Examples of solution processes are described in U.S. Pat. Nos.4,271,060, 5,001,205, 5,236,998, and 5,589,555 and PCT WO 99/32525,which are fully incorporated herein by reference.

In one embodiment, one or more monomers such as ethylene or one or moreC₄ to C₃₀ olefin(s) or alpha-olefin(s), can also be prepolymerized withpropylene in the presence of the catalyst systems described prior to themain polymerization. Prepolymerization is particularly preferred toprovide an added benefit of forming discrete particles of the polymer.In one embodiment, propylene is prepolymerized prior to polymerizationwith any other monomer such as ethylene. The prepolymerization can becarried out in a batch or continuous process. By “continuous” is meant asystem that operates (or is intended to operate) without interruption orcessation.

In one embodiment, the prepolymerization process is carried out in aslurry phase at effective prepolymerization temperatures and pressures,such as those temperatures and pressures described herein for thepolymerization process. Prepolymerization can take place with any olefinmonomer or combination and/or in the presence of any molecular weightcontrolling agent such as hydrogen. For examples of prepolymerizationprocedures, see U.S. Pat. Nos. 4,748,221; 4,789,359; 4,923,833;4,921,825; 5,283,278; 5,705,578 and European publication EP-B-0279 863and PCT Publication WO 97/44371, all of which are fully incorporatedherein by reference.

Hydrogen can be added to any reactor for molecular weight control. As iswell known to those skilled in the art, increased concentrations ofhydrogen relative to the concentration of monomer(s) in the reactorcause the production of polymer of lower number average and weightaverage molecular weights.

Density

In one or more embodiments, the polypropylenes produced according toembodiments described have a density of from about 0.85 g/cc to about0.96 g/cc, preferably from about 0.85 g/cc to about 0.94 g/cc, morepreferably from about 0.86 g/cc to about 0.91 g/cc. Density is measuredin accordance with ASTM method 1505.

Crystallinity

The polymers can be produced at different crystallinity levels. For highmoisture barrier applications, high molded part rigidity, polypropyleneof high crystallinity is desired. For flexible films, seal layer films,tough films and molded parts and high clarity articles, polypropylenesof lower crystallinity are favored.

Preferably, the polymers are low in crystallinity as measured bydifferential scanning calorimetry (DSC). In one embodiment, the polymersare exceptionally soft, while still retaining substantial tensilestrength and elasticity. In another embodiment, the polymers have acrystallinity that is relatively low, or in some cases, the polymershave little to no crystallinity. In such embodiments, the polymers havea crystallinity of not greater than 25%. In another embodiment, thecrystallinity is not greater than 20% or 15% or 10% or 5% or 1%. Suchembodiments are particularly preferred with regard to propylenecopolymers, particularly propylene-ethylene copolymers.

In another embodiment, the polymers have crystallinity of greater thanor equal to 10%. In another embodiment, the polymers have crystallinityof greater than or equal to 20%, or greater than or equal to 30%, orequal to 40%, or greater than or equal to 50%. Such an embodiment isparticularly preferred with regard to propylene homopolymer. The DSCmethod to measure crystallinity in polypropylene is described in WO04/014998, Test Methods section at pages 72-73. In other embodiments,the propylene polymers have a crystallinity that is high (e.g. greaterthan 50%, preferably greater than 60%, preferably greater than 70%,preferably greater than 80%)

Diene Content

In another embodiment, the polymer produced by this invention issubstantially free of diene-derived units. Dienes are nonconjugateddiolefins which may be incorporated in polymers to facilitate chemicalcrosslinking reactions. “Substantially free of diene” is defined to beless than 1% diene, or less than 0.5% diene, or less than 0.1% diene, orless than 0.05% diene, or equal to 0%. All of these percentages are bytotal weight of the copolymer that incorporates the diene units. Thepresence or absence of diene can be determined by conventional infraredtechniques.

Melt Flow Rate

The invention is capable of producing a polymer having a Melt Flow Rate(MFR) as appropriate for the desired end use. For purposes herein, MFRis measured according to ASTM D 1238-95 (230° C., 2.16 kg for PP 190°C., 2.16 kg for all other polymers). In one embodiment, the polymershave a MFR in the range of from 0.2 to 5000 dg/min, preferably, from 0.4to 3000 dg/min, and preferable from 1 to 2500 dg/min.

Melt Index

The invention is capable of producing a polymer having a melt index asappropriate for the desired end use. The melt index (MI) is preferablymeasured according to ASTM D 1238 (230° C., 2.16 kg for PP, 190° C.,2.16 kg for all other polymers). In one embodiment, the polymers have amelt index of from about 1 dg/min to 3000 dg/min. Preferably, thepolymers have a melt index of from about 10 dg/min to about 1000 dg/min,and most preferably from about 20 to about 750 dg/min. In a particularembodiment, a propylene copolymer can be produced that has a melt indexof from about 10 dg/min to about 2500 dg/min, or from about 15 dg/min toabout 2000 dg/min.

Melting Point

The invention is capable of producing a polymer having a meltingtemperature or melting point as appropriate for the desired end use. Inone embodiment, a polymer is produced having a melting point greaterthan or equal to 75° C. In another embodiment, a polymer is producedhaving a melting point greater than or equal to 150° C. In anotherembodiment, the polymers have a melting point of greater than or equalto 95° C. or greater than or equal to 100° C. In a preferred embodiment,the polymers have a melting point in a range of from about 50° C. to200° C., preferably in the range of from about 60° C. to 190° C., morepreferably in the range of from about 70° C. to about 180° C. Apreferred method for measuring melting point is Differential ScanningCalorimetry (DSC) analysis (ASTM E-794-95).

Heat of Fusion

The invention is capable of producing a polymer having a relatively lowheat of fusion. In one embodiment, the polymer that is produced has aheat of fusion of not greater than 140 J/g. In another embodiment, thepolymers have a heat of fusion not greater than 110 J/g, or 100 J/g, or80 J/g, as determined by DSC. In another embodiment the polymersproduced herein have a heat of fusion of at least 5 J/g, preferably atleast 10 J/g.

The procedure for determining Heat of Fusion, among other things, byDifferential Scanning Calorimetry (DSC) is described as follows.Preferably, about 6 mg to about 10 mg of a sheet of the polymer ispressed at approximately 200° C. to 230° C., removed with a punch dieand is annealed at room temperature for 48 hours. At the end of thisperiod, the sample is placed in a Differential Scanning Calorimeter (TAInstruments, Model 2920) and cooled to about −50° C. The sample is thenheated at about 10° C./min to about 230° C. The thermal output isrecorded as the area under the melting peak of the sample which istypically at a maximum peak at about 30° C. to about 175° C. and occursbetween the temperatures of about 0° C. and about 200° C. The thermaloutput is measured in Joules per gram as a measure of the heat offusion. The melting point is recorded as the peak temperature in themelting peak. The percent crystallinity is calculated using the formula,[area under the curve (Joules/gram)/B (Joules/gram)]*100, where B is theheat of fusion for the homopolymer of the major monomer component. Thevalues for B were obtained from the Polymer Handbook, Fourth Edition,published by John Wiley and Sons, New York 1999. A value of 189 J/g (B)is used as the heat of fusion for polypropylene.

Molecular Weight and Molecular Weight Distribution

Molecular weight distribution (MWD) is a measure of the range ofmolecular weights within a given polymer sample. It is well known thatthe breadth of the MWD can be characterized by the ratios of variousmolecular weight averages, such as the ratio of the weight averagemolecular weight to the number average molecular weight, Mw/Mn, or theratio of the Z-average molecular weight to the weight average molecularweight, Mz/Mw.

Mw, Mn and Mz are measured by GPC (Gel Permeation Chromatography) usinga differential refractive index (DRI) detector. This method uses aWaters 150C GPC gel permeation chromatograph equipped with a Watersdifferential refractometer that measures the difference between therefractive index of the solvent and that of the solvent containing thefractionated polymer. The system is used at 145° C. with1,2,4-trichlorobenzene (TCB) as the mobile phase and stabilized withabout 250 ppm of butylated hydroxy toluene (BHT). The flow rate ispreferably 0.5 mL/min. Three PLgel Mixed-B columns (PolymerLaboratories) are also used in this measurement. This technique isdiscussed in Macromolecules, Vol. 34, No. 19, pp. 6812-6820, which isincorporated herein by reference.

The separation efficiency of the column set can be calibrated using aseries of narrow Mw/Mn and Mw/Mz polystyrene standards, which reflectthe expected Mw range for samples and the exclusion limits of the columnset. At least 10 individual polystyrene (PS) standards, ranging from Mw580 to 10,000,000, are preferably used to generate the calibrationcurve. The polystyrene standards can be readily obtained from knownsources such as Polymer Laboratories (Amherst, Mass.) or an equivalentsource. To assure internal consistency, the flow rate is preferablycorrected for each calibrant run to give a common peak position for theflow rate marker (taken to be the positive inject peak) beforedetermining the retention volume for each polystyrene standard. The flowmarker peak position is preferably used to correct the flow rate whenanalyzing samples. A calibration curve (logMw vs. retention volume) canbe generated by recording the retention volume at the peak in the DRIsignal for each PS standard, and fitting this data set to a 2^(nd) orderpolynomial. Samples can be analyzed using WaveMetrics, Inc. IGOR Pro andViscotec 3.0 software, for example, using updated calibration constants.The columns are preferably calibrated using sixteen polystyrenestandards of known molecular weights. A correlation of polystyreneretention volume obtained from the standards, to the retention volume ofthe polymer tested yields the polymer molecular weight.

Average molecular weights M can be computed from the expression:

$M = \frac{\sum\limits_{i}{N_{i}M_{i}^{n + 1}}}{\sum\limits_{i}{N_{i}M_{i}^{n}}}$where N_(i) is the number of molecules having a molecular weight M_(i).When n=0, M is the number average molecular weight Mn. When n=1, M isthe weight average molecular weight Mw. When n=2, M is the Z-averagemolecular weight Mz. The desired MWD function (e.g., Mw/Mn or Mz/Mw) isthe ratio of the corresponding M values. Measurement of M and MWD iswell known in the art and is discussed in more detail in, for example,Slade, P. E. Ed., Polymer Molecular Weights Part II, Marcel Dekker,Inc., NY, (1975), pp. 287-368; Rodriguez, F., Principles of PolymerSystems 3rd ed., Hemisphere Pub. Corp., NY, (1989), pp. 155-160; U.S.Pat. No. 4,540,753; Verstrate et al., Macromolecules, vol. 21, (1988),p. 3360; and references cited therein.

In one embodiment, the polymer produced herein has a weight averagemolecular weight (Mw) of from 5,000 to 5,000,000, or from 20,000 to1,000,000. The polymer can have an M_(n) (number-average molecularweight) value from 300 to 1,000,000, or between from 700 to 300,000. Thepolymer can have a molecular weight distribution (MWD), which is definedas a ratio of weight average molecular weight to number averagemolecular weight (MWD=M_(w)/M_(n)), of greater than 1, preferably from1.5 to about 20. In some embodiments, the polymer has a M_(w)/M_(n), ofat least 1, preferably from about 1 to 15, while in other embodimentsthe polymer has a M_(w)/M_(n) of at least 1.5, preferably from about 1.5to 10 or about 2 to 9 or about 3 to 8 or about 3 to 7 or about 2 to 10.

Tacticity

The tacticity index, expressed herein as “m/r,” can be determined by ¹³Cnuclear magnetic resonance (NMR). The tacticity index m/r is calculatedas defined in H. N. Cheng, Macromolecules, 17, p. 1950, (1984). Thedesignation “m” or “r” describes the stereochemistry of pairs ofcontiguous propylene groups, “m” referring to meso and “r” to racemic.An m/r ratio of 1.0 generally describes a syndiotactic polymer, and anm/r ratio of 2.0 an atactic material. An isotactic materialtheoretically may have a ratio approaching infinity, and many by-productatactic polymers have sufficient isotactic content to result in ratiosof greater than 50. Various embodiments preferably have a tacticityindex m/r ranging from a lower limit of 4 or 6 to an upper limit of 8 or10 or 12.

An ancillary procedure for the description of the tacticity of thepropylene units is the use of triad tacticity index. The triad tacticityindex of a polymer is the relative tacticity of a sequence of threeadjacent propylene units, a chain consisting of head to tail bonds,expressed as a binary combination of m and r sequences. It is usuallyexpressed as the ratio of the number of units of the specified tacticityto all of the propylene triads in the copolymer.

The triad tacticity (mm fraction) index of a propylene polymer can bedetermined from a ¹³C NMR spectrum and the following formula:

${m\; m\mspace{11mu}{Fraction}} = \frac{{PPP}\left( {m\; m} \right)}{{{PPP}\left( {m\; m} \right)} + {{PPP}({mr})} + {{PPP}({rr})}}$where PPP(mm), PPP(mr) and PPP(rr) denote peak areas derived from themethyl groups of the second units in the following three propylene unitchains consisting of head-to-tail bonds:

The ¹³C NMR spectrum of the propylene polymer is measured as describedin U.S. Pat. No. 5,504,172. The spectrum relating to the methyl carbonregion [19-23 parts per million (ppm)] can be divided into a firstregion (21.2-21.9 ppm), a second region (20.3-21.0 ppm) and a thirdregion (19.5-20.3 ppm). Each peak in the spectrum was assigned withreference to an article in the journal Polymer, Volume 30, (1989), p.1350.

In the first region, the methyl group of the second unit in the threepropylene unit chain represented by PPP (mm) resonates. In the secondregion, the methyl group of the second unit in the three propylene unitchain represented by PPP (mr) resonates, and the methyl group(PPE-methyl group) of a propylene unit whose adjacent units are apropylene unit and an ethylene unit resonates (in the vicinity of 20.7ppm). In the third region, the methyl group of the second unit in thethree propylene unit chain represented by PPP (rr) resonates, and themethyl group (EPE-methyl group) of a propylene unit whose adjacent unitsare ethylene unit resonates (in the vicinity of 19.8 ppm).

The calculation of the triad tacticity index is outlined in thetechniques shown in U.S. Pat. No. 5,504,172. Subtraction of the peakareas for the error in propylene insertions (both 2,1 and 1,3) from peakareas from the total peak areas of the second region and the thirdregion, the peak areas based on the 3 propylene unit-chains [PPP(mr) andPPP(rr)] consisting of head-to-tail bonds can be obtained. Thus, thepeak areas of PPP(mm), PPP(mr) and PPP(rr) can be evaluated, and hencethe triad tacticity index of the propylene unit chain consisting ofhead-to-tail bonds can be determined.

In one embodiment, the polymers have a triad tacticity index of threepropylene units, as measured by ¹³C NMR, of greater than 75%, or greaterthan 80%, or greater than 82%, or greater than 85%, or greater than 90%.

The insertion of propylene can occur to a small extent by either 2,1(tail to tail) or 1,3 insertions (end to end). Examples of 2,1 insertionare shown in structures 1 and 2 below.

where n≧2.

A peak of the carbon A and a peak of the carbon A′ appear in the secondregion. A peak of the carbon B and a peak of the carbon B′ appear in thethird region, as described above. Among the peaks which appear in thefirst to third regions, peaks which are not based on the 3 propyleneunit chain consisting of head-to-tail bonds are peaks based on thePPE-methyl group, the EPE-methyl group, the carbon A, the carbon A′, thecarbon B, and the carbon B′.

The peak area based on the PPE-methyl group can be evaluated by the peakarea of the PPE-methine group (resonance in the vicinity of 30.8 ppm),and the peak area based on the EPE-methyl group can be evaluated by thepeak area of the EPE-methine group (resonance in the vicinity of 33.1ppm). The peak area based on the carbon A can be evaluated by twice asmuch as the peak area of the methine carbon (resonance in the vicinityof 33.9 ppm) to which the methyl group of the carbon B is directlybonded; and the peak area based on the carbon A′ can be evaluated by thepeak area of the adjacent methine carbon (resonance in the vicinity of33.6 ppm) of the methyl group of the carbon B′. The peak area based onthe carbon B can be evaluated by the peak area of the adjacent methinecarbon (resonance in the vicinity of 33.9 ppm); and the peak area basedon the carbon B′ can be also evaluated by the adjacent methine carbon(resonance in the vicinity of 33.6 m).

By subtracting these peak areas from the total peak areas of the secondregion and the third region, the peak areas based on the three propyleneunit chains [PPP(mr) and PPP(rr)] consisting of head-to-tail bonds canbe obtained. Thus, the peak areas of PPP(mm), PPP(mr) and PPP(rr) can beevaluated, and the triad tacticity of the propylene unit chainconsisting of head-to-tail bonds can be determined.

The proportion of the 2,1-insertions to all of the propylene insertionsin a propylene elastomer can be calculated by the following formula withreference to article in the journal Polymer, vol. 30 (1989), p. 1350.

Proportion of inversely inserted unit based on 2,1-insertion (%)=

$\frac{{0.25I\;{\alpha\beta}\mspace{14mu}\left( {{structure}\mspace{11mu}(i)} \right)} + {0.5I\;{\alpha\beta}\mspace{14mu}\left( {{structure}\mspace{11mu}({ii})} \right)}}{\begin{matrix}{{I\;{\alpha\alpha}} + {I\;{\alpha\beta}\mspace{14mu}\left( {{structure}\mspace{11mu}({ii})} \right)} +} \\{0.5\left( {{I\;{\alpha\gamma}} + {I\;{\alpha\beta}\mspace{14mu}\left( {{structure}\mspace{11mu}(i)} \right)} + {I\;{\alpha\delta}}} \right)}\end{matrix}} \times 100$

Naming of the peaks in the above formula was made in accordance with amethod by Carman, et al. in the journal Rubber Chemistry and Technology,volume 44 (1971), p. 781, where I_(αδ) denotes a peak area of the αδ⁺secondary carbon peak. It is difficult to separate the peak area of Iαβ[structure (i)] from Iαβ [structure (ii)] because of overlapping of thepeaks. Carbon peaks having the corresponding areas can be substitutedtherefor.

The measurement of the 1,3 insertion requires the measurement of the βγpeak. Two structures can contribute to the βγ peak: (1) a 1,3 insertionof a propylene monomer; and (2) from a 2,1-insertion of a propylenemonomer followed by two ethylene monomers. This peak is described as the1,3 insertion peak, and the procedure described in U.S. Pat. No.5,504,172 can be used, which describes this βγ peak, and which isunderstood to represent a sequence of four methylene units. Theproportion (%) of the amount of these errors was determined by dividingthe area of the βγ peak (resonance in the vicinity of 27.4 ppm) by thesum of all the methyl group peaks and ½ of the area of the βγ peak, andthen multiplying the resulting value by 100. If an α-olefin of three ormore carbon atoms is polymerized using an olefin polymerizationcatalyst, a number of inversely inserted monomer units are present inthe molecules of the resultant olefin polymer. In polyolefins preparedby polymerization of α-olefins of three or more carbon atoms in thepresence of a chiral bulky ligand metallocene-type catalyst,2,1-insertion or 1,3-insertion takes place in addition to the usual1,2-insertion, such that inversely inserted units such as a2,1-insertion or a 1,3-insertion are formed in the olefin polymermolecule [see, Macromolecular Chemistry Rapid Communication, Volume 8,p. 305 (1987), by K. Soga, T. Shiono, S. Takemura and W. Kaminski].

In one embodiment, the proportion of inversely inserted propylene units,based on the 2,1-insertion of a propylene monomer in all propyleneinsertions, as measured by ¹³C NMR, is greater than 0.5%, or greaterthan 0.6%.

In one embodiment, the proportion of inversely inserted propylene units,based on the 1,3-insertion of a propylene monomer, as measured by ¹³CNMR, is greater than 0.05%, or greater than 0.06%, or greater than0.07%, or greater than 0.08%, or greater than 0.085 percent.

Intermolecular Distribution of Tacticity

Various embodiments preferably have a statistically insignificantintermolecular difference of tacticity of polymerized propylene betweendifferent chains (intermolecularly). This can be determined by thermalfractionation by controlled dissolution generally in a single solvent,at a series of slowly elevated temperatures. These controlleddissolution procedures are commonly used to separate similar polymers ofdifferent crystallinity due to differences in isotactic propylenesequences, as shown in the article in “Macromolecules”, Vol. 26, p. 2064(1993).

In one embodiment, at least 75% by weight, or at least 80% by weight, orat least 85% by weight, or at least 90% by weight, or at least 95% byweight, or at least 97% by weight, or at least 99% by weight of thepolymer is soluble in a single temperature fraction, or in two adjacenttemperature fractions, with the balance of the polymer in immediatelypreceding or succeeding temperature fractions. These percentages arefractions, beginning at 23° C. and the subsequent fractions are inapproximately 8° C. increments above 23° C. Meeting such a fractionationrequirement means that a polymers have statistically insignificantintermolecular differences of tacticity of the polymerized propylene.

Intermolecular Distribution of Composition

Various propylene-ethylene copolymer embodiments have statisticallyinsignificant intermolecular differences of composition, which is theratio of propylene to ethylene between different chains(intermolecular). This compositional analysis is by infraredspectroscopy of the fractions of the polymer obtained by the controlleddissolution procedure described above.

A measure of the statistically insignificant intermolecular differencesof composition, each of these fractions has a composition (wt. %ethylene content) with a difference of less than 1.5 wt. % (absolute) orless than 1.0 wt. % (absolute), or less than 0.8 wt. % (absolute) of theaverage wt. % ethylene content of the whole copolymer. Meeting such afractionation requirement means that a polymer has statisticallyinsignificant intermolecular differences of composition, which is theratio of propylene to ethylene.

Polymer Blends and Articles

In one or more embodiments, polymers produced using the activatorsystems described herein can be blended and/or coextruded with any otherpolymer or polymers, to form any number and kinds of articles.Non-limiting examples of other polymers include linear low densitypolyethylenes produced via conventional Ziegler-Natta and/or bulkyligand metallocene-type catalysis, elastomers, plastomers, high pressurelow density polyethylene, high density polyethylenes, and the like.

The polymers are useful in such forming operations as film, sheet, andfiber extrusion and co-extrusion as well as blow molding, injectionmolding and rotary molding. Films include blown or cast films formed bycoextrusion or by lamination useful as shrink film, cling film, stretchfilm, sealing films, oriented films, snack packaging, heavy duty bags,grocery sacks, baked and frozen food packaging, medical packaging,industrial liners, membranes, etc., in food-contact and non-food contactapplications. Fibers include melt spinning, solution spinning and meltblown fiber operations for use in woven or non-woven form to makefilters, diaper fabrics, medical garments, geotextiles, etc. Extrudedarticles include medical tubing, wire and cable coatings, pipe,geomembranes, and pond liners. Molded articles include single andmulti-layered constructions in the form of bottles, tanks, large hollowarticles, rigid food containers and toys, etc.

The films can be formed by any of the conventional techniques known inthe art including extrusion, co-extrusion, lamination, blowing andcasting. The film may be obtained by the flat film or tubular processwhich may be followed by orientation in a uniaxial direction or in twomutually perpendicular directions in the plane of the film to the sameor different extents. Orientation may be to the same extent in bothdirections or may be to different extents. Particularly preferredmethods to form the polymers into films include extrusion or coextrusionon a blown or cast film line.

In another embodiment, the polymers are made into a film by methodsknown in the art. For film applications, the polymers have an I₂₁ valueof from about 2 to about 100 dg/min, preferably from about 2 to about 50dg/min, and more preferably from about 2 to about 30 dg/min. I₂₁ ismeasured by ASTM Method D 1238.

In another embodiment, the polymers are made into a molded article bymethods known in the art, for example, by blow molding andinjection-stretch molding. For molded applications, the polymers have aI₂₁ of from about 20 dg/min to about 50 dg/min and preferably from about35 dg/min to about 45 dg/min.

In another embodiment, the polymers are made into a pipe by methodsknown in the art. For pipe applications, the polymers have an I₂₁ offrom about 2 to about 10 dg/min and preferably from about 2 to about 8dg/min. In another embodiment, the pipe satisfies ISO qualifications. Inanother embodiment, the present invention is used to make polyethylenepipe having a predicted S-4 Tc for 110 mm pipe of less than −5° C.,preferably of less than −15° C. and more preferably less than −40° C.(ISO DIS 13477/ASTM F1589).

In another embodiment, the polymers have an extrusion rate of greaterthan about 17 lbs/hour/inch (3.04 Kg/hr/cm) of die circumference andpreferably greater than about 20 lbs/hour/inch (4.04 Kg/hr/cm) of diecircumference and more preferably greater than about 22 lbs/hour/inch(4.44 Kg/hr/cm) of die circumference.

The objects produced (such as films, pipes, etc.) may further containadditives such as slip, antiblock, antioxidants, pigments, fillers,antifog, UV stabilizers, antistats, polymer processing aids,neutralizers, lubricants, surfactants, pigments, dyes and nucleatingagents. Preferred additives include silicon dioxide, synthetic silica,titanium dioxide, polydimethylsiloxane, calcium carbonate, metalstearates, calcium stearate, zinc stearate, talc, BaSO₄, diatomaceousearth, wax, carbon black, flame retarding additives, low molecularweight resins, hydrocarbon resins, glass beads and the like. Theadditives may be present in the typically effective amounts well knownin the art, such as 0.001 wt. % to 10 wt. %.

Other Embodiments

In another embodiment, this invention relates to:

-   1. A process for polymerizing propylene comprising:    -   contacting propylene and optionally one or more monomers with a        catalyst system comprising a bis-indenyl Group 4 metallocene        compound supported on silica, the silica treated with one or        more organoaluminum compounds and one or more heterocyclic        compounds, under slurry conditions in the presence of hydrogen        at a temperature of about 50° C. to about 160° C. and a pressure        of from about 3 MPa to about 20 MPa to provide a catalyst        activity of greater than 30,000 pounds of product per pound of        catalyst; and then    -   recovering isotactic polypropylene having a melt flow rate of 20        dg/min or less.-   2. The process of paragraph 1, wherein the one or more heterocyclic    compounds are represented by formula (I):

where each of X2 to X7 is independently hydrogen, halogen, an alkylgroup, a halogenated or partially halogenated alkyl group, an arylgroup, an alkoxide group, a halogenated or partially halogenatedalkoxide group, an aryloxide group, a halogenated or partiallyhalogenated aryloxide group, an aryl substituted alkyl group, or ahalogenated or partially halogenated aryl substituted alkyl group.

-   3. The process of paragraph 2, wherein each of X4, X5, X6, and X7 is    a fluorine atom.-   4. The process of any of paragraphs 1 to 3, wherein the one or more    heterocyclic compounds comprises 4,5,6,7-tetrafluoroindole.-   5. The process of any of paragraphs 1 to 4, wherein the one or more    organoaluminum compounds comprises an alkyl aluminum compound or    alumoxane.-   6. The process of any of paragraphs 1 to 5, wherein the one or more    organoaluminum compounds is selected from the group consisting of    trimethylaluminum, triethylaluminum, triisobutylaluminum,    tri-n-hexylaluminum, tri-n-octylaluminum, tri-iso-octylaluminum,    triphenylaluminum, triisobutyl aluminum, tri-n-octyl aluminum, and    mixtures thereof.-   7. The process of any of paragraphs 1 to 6, wherein the one or more    organoaluminum compounds comprises triethylaluminum.-   8. The process of any of paragraphs 1 to 7, wherein the bis-indenyl    Group 4 metallocene compound comprises a bridged bis-indenyl Group 4    metallocene compound.-   9. The process of any of paragraphs 1 to 7, wherein the bis-indenyl    Group 4 metallocene compound comprises zirconium.-   10. The process of any of paragraphs 8 or 9, wherein the bridged    bis-indenyl Group 4 metallocene compound comprises zirconium.-   11. The process of any of paragraphs 1 to 10, wherein the    bis-indenyl Group 4 metallocene compound comprises    rac-dimethylsilylbis[(2-methyl-4-phenyl)indenyl]zirconium dimethyl.-   12. The process of any of paragraphs 1 to 11, wherein the    bis-indenyl Group 4 metallocene compound comprises    rac-dimethylsilylbis[(2-methyl)indenyl]zirconium dimethyl.

EXAMPLES

The foregoing discussion can be further described with reference to thefollowing non-limiting examples. The following examples are intended toillustrate the invention with particular detail. Numerous modificationsand variations are possible, and it is to be understood that within thescope of the appended claims, the invention can be practiced otherwisethan as specifically described herein.

Example 1

In a drybox, 105 grams of freshly dehydrated 952× SiO₂ (200° C., 6 hr)and approximately 300 mL of anhydrous toluene were added to a 500 mLCelstir flask equipped with a overhead magnetic stirrer. While stirringthe slurry at room temperature, triethylaluminum (TEAL) solution (43.0g, 0.377 mole) was slowly added dropwise. Upon addition of the TEALsolution, the flask became warm. The stirring was continued for 12 hr atroom temperature. The slurry was filtered using a fritted funnel, washedwith toluene (2×75 mL) and pentane (1×75 mL) and dried in vacuoovernight (˜15 hr). TEAL-treated silica samples were recovered in >90%yield and used immediately.

In a drybox, 115 grams of the TEAL-treated silica and 350 mL ofanhydrous o-xylene was added to a 500 ml Celstir flask equipped with anoverhead magnetic stirrer. To the stirred slurry was added an o-xylenesolution of 4,5,6,7-tetrafluoroindole (20.95 g, 0.111 mole). Afterstirring for 15 minutes at room temperature, the reaction mixture washeated to 100° C. After the first 30 minutes at 100° C., the color ofthe solution was golden yellow. On continued heating, the color of thesolution turned dark red. The reaction mixture was heated for a total of3 hours. The reaction mixture was allowed to cool to room temperature,filtered using a fritted funnel, washed with toluene (3×75 mL) andfinally, pentane (1×75 mL), and dried in vacuo for ˜15 hours. Thereaction yielded the indole-modified, TEAL-treated silica samples asgolden yellow solids.

In a drybox, 110 grams of the indole-modified TEAL-treated silica and300 mL of anhydrous toluene was added to a 500 ml Celstir flask equippedwith an overhead magnetic stirrer. To the stirred slurry was added asolution of rac-dimethylsilylbis(2-methyl-4-phenyl)indenyl zirconiumdimethyl (0.323 g, 0.55 mmol) in toluene. The slurry was stirred at roomtemperature for 8 hours. After this time, the reaction mixture wasfiltered using a fritted funnel, washed with toluene (3×75 mL) and thenpentane (1×75 mL), and dried in vacuo for 15 hours. The catalyst wasslurried in mineral oil (10 wt %) for polymerization.

Comparative Example 1

Comparative Example 1 was a silica supported MAO system withrac-dimethylsilylbis[(2-methyl)indenyl]zirconium dimethyl as themetallocene catalyst component. The catalyst was prepared utilizing aGrace Davison 952× silica support (300 m² per gram, 0.9 mmol OH pergram, 30 mm particle size) that was calcined at 500° C. The support wasthen treated with 4.5 mmol MAO per g of silica. The MAO-silica supportwas then treated with 17 micromoles (μmol) of rac-dimethylsilylbis[(2-methyl)indenyl]zirconium dimethyl per gram of silica. Thecatalyst had an Al:Zr ratio of about 265:1.

Comparative Example 2

Comparative Example 2 was a silica supported, non-coordinating anioncatalyst system withrac-dimethylsilylbis[(2-methyl-4-phenyl)indenyl]zirconium dimethyl asthe metallocene catalyst component. The catalyst was prepared utilizinga Grace Davison 952× silica support (240 m² per gram, 0.22 mmol OH pergram) calcined at 500° C. with 3 wt % (NH₄)₂SiF₆. The support was thentreated with 11 mmol of B(C₆F₆)₃ and diethylaniline per g of silica. Thesupport was then treated with 15 micromoles of rac-dimethylsilylbis[(2-methyl-4-phenyl)indenyl]zirconium dimethyl per gram of silica.

The lab reactor polymerizations were conducted in a 2-1 autoclave,utilizing either a 1 M solution of TEAL or neat TEAL as a scavenger and800 mL propylene. Polymerizations were conducted at 70° C. for 1 hour.The pressure was about 500 psig (3,450 kPa). Unless noted otherwise,hydrogen was introduced into the autoclave using a 50 cc gas vesselpressurized to 30 psig, prior to the introduction of propylene. Afterthe scavenger, hydrogen and propylene were introduced into the autoclaveand heated to 70° C., the catalyst was introduced as a 10 wt % slurry inmineral oil via liquid propylene. The polymerization data is summarizedin Table 1.

TABLE 1 Lab Reactor Data Ex. 1 Comp. Ex. 1 Comp. Ex. 2 Catalyst slurry(g) 0.523 0.512 0.504 Catalyst (g) 0.0523 0.102 0.0504 Catalyst loading(micromoles 5 17 15 metallocene/g support) H₂ charge (psi) 20 0 50Scavenger (mL) 0.5 0.25 0.5 Yield (g) 229.5 156.1 240.7 Catalystactivity (g pol/g) 4385 1524 4780 Mw 370583 170276 189848 Mw/Mn 2.57 1.92.25 Bulk density (g/cm3) 0.44 0.35 Tm-DSC 2^(nd) melt (° C.) 150.2147.1 152

Bulk density was measured as follows. A 10 cc graduated cylinder wasweighed empty and the weight tared. Polymer particles were added tomeasure 10 cc in volume. The cylinder was weighed again to determine theweight of polymer particles only. Bulk density was calculated by weightin grams (g) of particles/10 cc.

MFR was measured according to ASTM 1238 at 230° C., 2.16 Kg usingstandard die units.

Melting point (Tm) was measured by Differential Scanning Calorimetry(DSC) analysis. DSC trace data was obtained using a TA Instruments model2920 machine. Samples weighing approximately 7 mg to 10 mg were sealedin aluminum sample pans. The DSC data was recorded by first cooling thesample to −50° C. and then gradually heating it to 220° C. at a rate of10° C./minute. The sample was kept at 220° C. for 5 minutes before asecond cooling-heating cycle was applied. Both the first and secondcycle thermal events were recorded. Areas under the melting curves weremeasured and used to determine the heat of fusion and the degree ofcrystallinity. The percent crystallinity was calculated using theformula, [area under the curve (Joules/gram)/B (Joules/gram)]*100, whereB is the heat of fusion for the homopolymer of the major monomercomponent. The values for B were obtained from the Polymer Handbook,Fourth Edition, published by John Wiley and Sons, New York 1999. A valueof 189 J/g (B) is used as the heat of fusion for polypropylene.

Mw, Mn, Mz and Mw/Mn were determined using an instrument containingcolumns packed with porous beads, an elution solvent, and detector inorder to separate polymer molecules of different sizes. Molecularweights for ethylene propylene copolymers were measured by gelpermeation chromatography (GPC) using (1) an Alliance 2000 GPC3Dequipped with differential refractive index (DRI) and viscometrydetectors and an 18 angle light scattering detector or (2) a PolymerLabs 220 GPC 3D equipped with DRI, viscometry and an 3 angle lightscattering detector. Detectors were calibrated using polystyrenestandards. Samples were run in 1,2,4-trichlorobenzene (135° C.) usingthree Polymer Laboratories PC Gel mixed B LS columns in series. Acorrelation of polystyrene retention volume obtained from the standards,to the retention volume of the polymer tested yields the polymermolecular weight.

Average molecular weights M were computed from the expression:

$M = \frac{\sum\limits_{i}{N_{i}M_{i}^{n + 1}}}{\sum\limits_{i}{N_{i}M_{i}^{n}}}$

where Ni is the number of molecules having a molecular weight Mi; n=0;and M is the number average molecular weight Mn. When n=1, M is theweight average molecular weight Mw. When n=2, M is the Z-averagemolecular weight Mz. The desired MWD function (e.g., Mw/Mn or Mz/Mw) wasthe ratio of the corresponding M values.

Additional polymerizations were conducted in a medium scale reactor at70° C. and a pressure between about 450 psig (3,100 kPa) and 500 psig(3,450 kPa). After the scavenger, hydrogen and propylene were introducedand heated to 70° C., the supported catalyst was introduced as a 10 wt.% slurry in mineral oil via liquid propylene. The polymerization data issummarized in Table 2.

TABLE 2 Medium Scale Data Catalyst Productivity Final Tm (° C.) Example(lb product per lb catalyst) MFR Mw/Mn 2nd melt Example 1 46,700 1.6 1.9150 Comp. Ex. 1 5,000 22 1.7 150 Comp. Ex. 2 27,200 8.2 1.84 154.1

Referring to Table 2, the catalyst system of Example 1 provided asurprising and significantly improved catalyst activity (greater than46,000 lb product per lb catalyst) compared to both Comparative Examples1 and 2. Example 1 also showed a surprising and significantly widerproduct range as indicated by the final MFR and Mw/Mn ratio compared toComparative Example 1, and was surprisingly similar to that produced byComparative Example 2. Those results are particularly surprising andunexpected because the catalyst loading (micromole of metallocene/gsupport) in Example 1 is about ¼ the loading of Comparative Example 1and ⅓ the loading of Comparative Example 2 as shown in Table 1.

All documents described herein are incorporated by reference herein,including any priority documents and/or testing procedures to the extentthey are not inconsistent with this text. Parameters given in the claimsare measured according to the methods set forth herein for the relevantparameter or in the absence of a stated method can be determined by oneof ordinary skill in the art using known method.

Certain embodiments and features have been described using a set ofnumerical upper limits and a set of numerical lower limits. It should beappreciated that ranges from any lower limit to any upper limit arecontemplated unless otherwise indicated. Certain lower limits, upperlimits and ranges appear in one or more claims below. All numericalvalues are “about” or “approximately” the indicated value, and take intoaccount experimental error and variations that would be expected by aperson having ordinary skill in the art.

Various terms have been defined above. To the extent a term used in aclaim is not defined above, it should be given the broadest definitionpersons in the pertinent art have given that term as reflected in atleast one printed publication or issued patent.

As is apparent from the foregoing general description and the specificembodiments, while forms of the invention have been illustrated anddescribed, various modifications can be made without departing from thespirit and scope of the invention. Accordingly, it is not intended thatthe invention be limited thereby. Likewise, the term “comprising” isconsidered synonymous with the term “including” for purposes ofAustralian law.

1. A process for polymerizing propylene comprising: contacting propyleneand optionally one or more monomers with a catalyst system comprising abis-indenyl Group 4 metallocene compound supported on silica, said(silica having been treated with one or more organoaluminum compoundsand one or more heterocyclic compounds, under slurry conditions in thepresence of hydrogen at a temperature of about 50° C. to about 160° C.and a pressure of from about 3 MPa to about 20 MPa to provide a catalystactivity of greater than 30,000 pounds of product per pound of catalyst;and then recovering isotactic polypropylene having a melt flow rate of20 dg/min or less, wherein the one or more heterocyclic compounds arerepresented by formula (I):

where each of X2 to X7 is independently hydrogen, halogen, an alkylgroup, a halogenated or partially halogenated alkyl group, an arylgroup, an alkoxide group, a halogenated or partially halogenatedalkoxide group, an aryloxide group, a halogenated or partiallyhalogenated aryloxide group, an aryl substituted alkyl group, or ahalogenated or partially halogenated aryl substituted alkyl group. 2.The process of claim 1, wherein each of X4, X5, X6, and X7 is a fluorineatom.
 3. The process of claim 1, wherein the one or more heterocycliccompounds comprises 4,5,6,7-tetrafluoroindole.
 4. The process of claim1, wherein the one or more organoaluminum compounds comprises an alkylaluminum compound or alumoxane.
 5. The process of claim 1, wherein theone or more organoaluminum compounds is selected from the groupconsisting of trimethylaluminum, triethylaluminum, triisobutylaluminum,tri-n-hexylaluminum, tri-n-octylaluminum, tri-iso-octylaluminum,triphenylaluminum, triisobutyl aluminum, tri-n-octyl aluminum, andmixtures thereof.
 6. The process of claim 1, wherein the one or moreorganoaluminum compounds comprises triethylaluminum.
 7. The process ofclaim 1 wherein the bis-indenyl Group 4 metallocene compound comprises abridged bis-indenyl Group 4 metallocene compound.
 8. The process ofclaim 1 wherein the bis-indenyl Group 4 metallocene compound compriseszirconium.
 9. The process of claim 7 wherein the bridged bis-indenylGroup 4 metallocene compound comprises zirconium.
 10. The process ofclaim 1 wherein the bis-indenyl Group 4 metallocene compound comprisesrac-dimethylsilylbis [(2-methyl-4-phenyl)indenyl]zirconium dimethyl. 11.The process of claim 1 wherein the bis-indenyl Group 4 metallocenecompound comprises rac-dimethylsilylbis [(2-methyl)indenyl] zirconiumdimethyl.
 12. The process of claim 1 wherein the bis-indenyl Group 4metallocene compound is represented by the formula:Ly(Ind)(Ind*)M^(m)X_(n) where: Ind is a substituted or unsubstitutedindenyl group; Ind* is a substituted or unsubstituted indenyl group,which may be the same or different from Ind; L is a bridging groupconnecting (Ind) to (Ind*); y is 0 or 1; M is a Group 4 transitionmetal; m is 3, 4, 5 or 6; X is a halogen or a substituted orunsubstituted hydrocarbyl group, a Substituted or unsubstitutedhydrocarboxy group, or a substituted or unsubstituted heteroatomcontaining group; and n is m minus
 2. 13. The process of claim 12wherein L is represented by the formula: RqSi where each R is,independently, a substituted or unsubstituted C₁ to C₂₀ hydrocarbylgroup and q is 1, 2, 3 or
 4. 14. The process of claim 1 wherein L is adimethyl silyl group or a diphenylsilyl group.
 15. The process of claim1 wherein the Ind and Ind* groups are selected from the group consistingof: methyl-indenyl; methyl,butyl-indenyl; methyl,phenyl-indenyl;2-methyl-4-phenyl-indenyl; 2-methyl4(2,6-di-t-butyl) indenyl;2-methyl-4-naphthyl-indenyl; 2-ethyl-4-phenyl indenyl;4,5-dihydroindenyl, 4,7-dihydroindenyl, 4,5,6,7-tetrahydroindenyl,2-methyl-7-phenylindeny; and 2-propylindenyl.
 16. The process of claim 1wherein the bis-indenyl Group 4 metallocene compound is represented bythe formula

where M1 is selected from titanium, zirconium, or hafnium; R1 and R2 areidentical or different and are selected from hydrogen atoms, C1-C10alkyl groups, C1-C10 alkoxy groups, C6-C10 aryl groups, C6-C10 aryloxygroups, C2-C10 alkenyl groups, C2-C40 alkenyl groups, C7-C40 arylalkylgroups, C7-C40 alkylaryl groups, C8-C40 arylalkenyl groups, OH groups orhalogen atoms; or conjugated dienes that are optionally substituted withone or more hydrocarbyl, tri(hydrocarbyl)silyl groups or hydrocarbyl,tri(hydrocarbyl)silylhydrocarbyl groups, where the conjugated diene cancontain up to 30 atoms not counting hydrogen; R3 to R12 are the same ordifferent and are selected from hydrogen atoms, halogen atoms, C1-C10halogenated or unhalogenated alkyl groups, C6-C 10 halogenated orunhalogenated aryl groups, C2-C 10 halogenated or unhalogenated alkenylgroups, C7-C40 halogenated or unhalogenated arylalkyl groups, C7-C40halogenated or unhalogenated alkylaryl groups, C8-C40 halogenated orunhalogenated arylalkenyl groups, —NR′2, —SR′, —OR′, —OSiR′3 or —PR′2radicals in which R′ is one of a halogen atom, a C1-C10 alkyl group, ora C6-C10 aryl group; or two or more adjacent radicals R5 to R7 togetherwith the atoms connecting them can form one or more rings; R13 isselected from

—B(R¹⁴)—, —Al(R¹⁴)—, —Ge—, —Sn—, —O —, —S —, —SO—, —SO₂—, —N(R¹⁴)—,—CO—, —P(R¹⁴)——P(O)(R¹⁴)—, —B(NR¹⁴R¹⁵)— and —B[N(SiR¹⁴R¹⁵R¹⁶)₂]—•R¹⁴,R¹⁵ and R¹⁶ are each independently selected from hydrogen, halogen,C₁-C₂₀ alkyl groups, C₆-C₃₀ aryl groups, C₁-C₂₀ alkoxy groups, C₂-C₂₀alkenyl groups, C₇-C₄₀ arylalkyl groups, C₈-C₄₀ arylalkenyl groups andC₇-C₄₀ alkylaryl groups, or R¹⁴ and R¹⁵, together with the atom(s)connecting them, form a ring; and M³ is selected from carbon, silicon,germanium and tinor R13 is represented by the formula:

wherein R¹⁷ to R²⁴ are as defined for R¹ and R², or two or more adjacentradicals R¹⁷ to R²⁴, including R²⁰ and R²¹ , together with the atomsconnecting them form one or more rings; M² is carbon, silicon,germanium, or tin.
 17. The process of claim 1 wherein the bis-indenylGroup 4 metallocene compound is selected from the group consisting of:dimethylsilyl bis(2-methyl-indenyl) zirconium dichloride, dimethylsilylbis(2-methyl-indenyl)zirconium dimethyl, dimethylsilylbis(2-methyl,4,6-dipropyl-indenyl)zirconium dichloride; dimethylsilylbis(2-methyl,4,6-dipropyl-indenyl)zirconium dimethyl; dimethylsilylbis(2-methyl,4-phenyl-indenyl)zirconium dichloride; dimethylsilylbis(2-methyl,4-phenyl-indenyl)zirconium dimethyl; dimethylsilylbis(2-methyl,4-naphthyl-indenyl)zirconium dichloride; dimethylsilylbis(2-methyl,4-naphthyl-indenyl) zirconium dimethyl; dimethylsilylbis(2-ethyl,4-phenyl-indenyl) zirconium dichloride; dimethylsilylbis(2-ethyl,4-phenyl-indenyl) zirconium dimethyl; dimethylsilylbis(2-methyl,4-(di-tert-butyl-phenyl)-indenyl) zirconium dichloride;dimethylsilyl bis(2-methyl,4-(di-tert-butyl-phenyl)-indenyl) zirconiumdimethyl, dimethylsilyl bis(2-methyl-indenyl)hafnium dichloride,dimethylsilyl bis(2-methyl-indenyl)hafnium dimethyl, dimethylsilylbis(2-methyl,4,6-dipropyl-indenyl)hafnium dichloride; dimethylsilylbis(2-phenyl-indenyl)hafnium dichloride; dimethylsilylbis(2-methyl,4-phenyl -indenyl)hafnium dimethyl; dimethylsilylbis(2-methyl,4-naphthyl-indenyl) hafnium dichloride; dimethylsilylbis(2-methyl,4-naphthyl-indenyl) hafnium dimethyl; dimethylsilylbis(2-ethyl,4-phenyl-indenyl)hafnium dichloride; dimethylsilylbis(2-ethyl,4-phenyl-indenyl)hafnium dimethyl; dimethylsilylbis(2-methyl,4-(di-tert-butyl-phenyl)-indenyl)hafnium dichloride; anddimethylsilyl bis(2-methyl,4-(di-tert-butyl-phenyl)-indenyl)hafniumdimethyl.
 18. The process of claim 1 where in the polymer produced ishomopolypropylene.
 19. The process of claim 1 where in the polymerproduced comprises propylene and from 0.5 to 25 wt % ethylene.
 20. Theprocess of claim 1 wherein the bis-indenyl Group 4 metallocene compoundis selected from the group consisting of: dimethylsiladiyl(2-methyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂ zirconium dichloride;dimethylsiladiyl(2-ethyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂ zirconiumdichloride; dimethylsiladiyl(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-n-butyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconiumdichloride; dimethylsiladiyl(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-methyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂hafniumdichloride; dimethylsiladiyl(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-n-propyl, 4-[3′,5′-di-t-butylphenyl]indenyl) ₂hafniumdimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-butyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂hafniumdichloride; 9-silafluorendiyl(2-methyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-ethyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconiumdichloride; 9-silafluorendiyl(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-methyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂hafniumdichloride; 9-silafluorendiyl(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-n-propyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂hafniumdichloride; 9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-n-butyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂hafniumdichloride; 9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-methyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconiumdimethyl; dimethylsiladiyl(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-n-butyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconiumdimethyl; dimethylsiladiyl(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-methyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂hafniumdimethyl; dimethylsiladiyl(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-n-propyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂hafniumdimethyl dimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-n-butyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂hafniumdimethyl; dimethylsiladiyl(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl) ₂hafnium dimethyl;dimethylsiladiyl(2-sec-butyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dimethyl; dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl) ₂hafnium dimethyl;9-silafluorendiyl(2-methyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconiumdimethyl; 9-silafluorendiyl(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-methyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂hafniumdimethyl; 9-silafluorendiyl(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-n-propyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂hafniumdimethyl; 9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-n-butyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂hafniumdimethyl; 9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-methyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-ethyl,4-[3′,59′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-n-butyl,4[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-methyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-tert-butyl,4[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-methyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-methyl, 4-[3′,5′-bis-trifluoromethylphenyl]indenyl)2hafnium dichloride; 9-silafluorendiyl(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂ hafnium dichloride;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-methyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-methyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-tert-butyl, 4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-methyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-n-butyl, 4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-methyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-n-propyl, 4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂ hafnium dimethyl;9-silafluorendiyl(2-iso-propyl, 4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂ hafnium dimethyl;9-silafluorendiyl(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloridedimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-ethyl, 4-[3′,5′-di-iso-propylphenyl]indenyl) ₂hafniumdichloride; dimethylsiladiyl(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-n-butyl, 4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride; dimethylsiladiyl(2-iso-butyl,4[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-ethyl, 4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafniumdichloride; 9-silafluorendiyl(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyldimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-isobutyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-ethyl, 4-[3′,5′-di-iso-propylphenyl]indenyl) ₂hafniumdimethyl; dimethylsiladiyl(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-n-butyl, 4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl; dimethylsiladiyl(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-ethyl, 4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafniumdimethyl; 9-silafluorendiyl(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-methyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂zirconiumdichloride; dimethylsiladiyl(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-n-propyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂zirconiumdichloride; dimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-n-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂zirconiumdichloride; dimethylsiladiyl(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;dimetylailadiyl(2-sec-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂zirconiumdichloride; dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;dimethylsiladiyl(2-methyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdichloride; dimethylsiladiyl(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-n-propyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdichloride; dimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-n-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdichloride; dimethylsiladiyl(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-sec-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdichloride; dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-methyl, 4-[3 ,5′,-di-phenylphenyl]indenyl)₂hafniumdichloride; 9-silafluorendiyl(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-n-propyl, 4-[3′,5′-di-phenylphenyl]indenyl₂zirconiumdichloride; 9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-n-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂zirconiumdichloride; 9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;9-silafluorendiyl(2-methyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdichloride; 9-silafluorendiyl(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-n-propyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdichloride; 9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-n-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdichloride; 9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-sec-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdichloride; 9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;dimethylsiladiyl(2-methyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂zirconiumdimethyl; dimethylsiladiyl(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-n-propyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂zirconiumdimethyl; dimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-n-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂zirconiumdimethyl; dimethylsiladiyl(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;dimethylsiladiyl(2-methyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdimethyl; dimethylsiladiyl(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-n-propyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdimethyl; dimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-n-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdimethyl; dimethylsiladiyl(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-sec-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdimethyl; dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-methyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂zirconiumdimethyl; 9-silafluorendiyl(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-n-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-n-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂zirconiumdimethyl; 9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;9-silafluorendiyl(2-methyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdimethyl; 9-silafluorendiyl(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dichloride;9-silafluorendiyl(2-n-propyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdimethyl; 9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-n-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdimethyl; 9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;9-silafluorendiyl(2-sec-butyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂hafniumdimethyl; 9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂hafnium dimethyl;dimethylsiladiyl(2-methyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-iso-propyl, 4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-methyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-n-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-n-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylsiladiyl(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-methyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)_(2 l η)⁴-1,4-diphenyl-1,3-butadiene; 9-silafluorendiyl(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-methyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-n-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-n-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;9-silafluorendiyl(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-methyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-tert-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloridedimethylamidoborane(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-methyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-ethyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂zirconiumdichloride; dimethylamidoborane(2-n-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-n-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;dimethylamidoborane(2-methyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-iso-propyl, 4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-tert-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-iso-propyl, 4-[3′,5′-di-iso-propylphenyl]indenyl)η⁴-1,4-diphenyl-1,3-butadiene; dimethylamidoborane(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl1,3-butadiene;dimethylamidoborane(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-methyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-n-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-n-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;dimethylamidoborane(2-methyl, 4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl; dimethylamidoborane(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-tert-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyldimethylamidoborane(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-methyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-ethyl, 4-[3′,5′-di-phenylphenyl]indenyl)₂zirconiumdimethyl; dimethylamidoborane(2-n-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-n-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;dimethylamidoborane(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-methyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-ethyl,4-[3′,59-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-tert-butyl,4-[3′,59-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloridediisopropylamidoborane(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-n-butyl,4-[3′,59-di-iso-propylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-methyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-n-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-n-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;diisopropylamidoborane(2-methyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)²η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)²η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene; diisopropylamidoborane(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene; diisopropylamidoborane(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene; diisopropylamidoborane(2-tert-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene; diisopropylamidoborane(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl) η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-methyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-n-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-n-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;diisopropylamidoborane(2-methyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-ethyl,4-[3′,59-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-iso-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-tert-butyl, 4-[3′,59-bistrifluoromethylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-n-butyl,4-[3′,59-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-methyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-n-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-n-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;diisopropylamidoborane(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-methyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-iso-propyl,4-[3′,59-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-tert-butyl,4-[3′,59-bis-trifluoromethylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloridebis(trimethylsilyl)amidoborane(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-methyl,4-[3′,59-di-phenylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-n-propyl,4-[3′,59-di-phenylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-n-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dichloride;bis(trimethylsilyl)amidoborane(2-methyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂ η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-iso-propyl,4-[3′,59-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-tert-butyl,4-[3′,59-bis-trifluoromethylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-ethyl,4-[3′,5′-di-isopropylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂ η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂ η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂ η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂ η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂ η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-methyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-ethyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-n-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂ η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-n-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-sec-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-tert-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂η⁴-1,4-diphenyl-1,3-butadiene;bis(trimethylsilyl)amidoborane(2-methyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-ethyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-n-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-iso-propyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-n-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-iso-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-sec-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-tert-butyl,4-[3′,5′-di-t-butylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-ethyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-n-propyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-iso-propyl,4-[3′,59-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-n-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-iso-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-sec-butyl,4-[3′,5′-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-tert-butyl,4-[3′,59-bis-trifluoromethylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-ethyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-n-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethylbis(trimethylsilyl)amidoborane(2-iso-propyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-n-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-iso-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-sec-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-tert-butyl,4-[3′,5′-di-iso-propylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-methyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-ethyl, 4-[3′,5′-diphenylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-n-propyl,4-[3′,59-di-phenylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-iso-propyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-n-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-iso-butyl,4-[3′,5′-di-phenylphenyl]indenyl)₂ zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-sec-butyl,4-[3′,5′-di-phenyiphenyl]indenyl)₂zirconium dimethyl;bis(trimethylsilyl)amidoborane(2-tert-butyl, 4-[3′,5′-di-phenyiphenyl]indenyl)₂ zirconium dimethyl;rac-dimethylsilyl-bis(indenyl)hafniumdimethyl;rac-dimethylsilyl-bis(indenyl)hafniumdichloride;rac-dimethylsilyl-bis(indenyl)zirconiumdimethyl;rac-dimethylsilyl-bis(indenyl)zirconiumdichloride;rac-dimethylsilyl-bis(2-methyl-4-phenyl-indenyl)hafniumdimethyl;rac-dimethylsilyl-bis(2-methyl-4-phenyl-indenyl) hafniumdichloride;rac-dimethylsilyl-bis(2-methyl-4-phenyl-indenyl) zirconiumdimethyl;rac-dimethylsilyl-bis(2-methyl-4-phenyl-indenyl) zirconiumdichloride;rac-dimethylsilyl-bis(2-methyl-benzindenyl)hafniumdimethyl;rac-dimethylsilyl-bis(2-methyl-benzindenyl) hafniumdichloride;rac-dimethylsilyl-bis(2-methyl-benzindenyl) zirconiumdimethyl;rac-dimethylsilyl-bis(2-methyl-benzindenyl) zirconiumdichloride;rac-dimethylsilyl-bis-(2-methyl-indenyl) zirconiumdimethyl;rac-dimethylsilyl-bis-(2-methyl-indenyl) hafniumdimethyl;rac-dimethylsilyl-bis-(2-methyl-indenyl) hafniumdichloride;rac-dimethylsilyl-bis-(2-methyl-indenyl) zirconiumdichloride;rac-dimethylsilyl-bis(2-methyl-4-naphthyl-indenyl)hafniumdimethyl;rac-dimethylsilyl-bis(2-methyl-4-naphthyl-indenyl) zirconium dichloride;rac-dimethylsilyl-bis(2-methyl-4-naphthyl-indenyl) hafniumdichloride;rac-dimethylsilyl-bis(2-methyl-4-naphthyl-indenyl) zirconium dimethyl;rac-ethylene-bis(indenyl)hafniumdimethyl;rac-ethylene-bis(indenyl)hafniumdichloride;rac-ethylene-bis(indenyl)zirconiumdimethyl;rac-ethylene-bis(indenyl)zirconiumdichloride;rac-dimethylsilyl-bis(2-methyl-4-(2′-methyl-phenyl)-indenyl)hafniumdimethyl;rac-dimethylsilyl-bis(2-methyl-4-(2′-methyl-phenyl)-indenyl)hafniumdichloride;rac-dimethylsilyl-bis(2-methyl-4-(2′-methyl-phenyl)-indenyl)zirconiumdimethyl;rac-dimethylsilyl-bis(2-methyl-4-(2′-methyl-phenyl)-indenyl) zirconiumdichloride;rac-dimethylsilyl-bis(2-methyl-4-(4′-methyl-phenyl)-indenyl)hafniumdimethyl; rac-dimethylsilyl-bis(2-methyl-4-(4′-methyl-phenyl)-indenyl)hafnium dichloride;rac-dimethylsilyl-bis(2-methyl-4-(4′-methyl-phenyl)-indenyl) zirconiumdimethyl; rac-dimethylsilyl-bis(2-methyl-4-(4′-methyl-phenyl)-indenyl)zirconium dichloride;rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl) hafniumdimethyl;rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl) hafniumdichloriderac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)zirconium dimethyl;rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)zirconium dichloride;rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl) hafniumdimethyl;rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl) hafniumdichloride;rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)zirconium dimethyl;rac-dimethylsilyl-bis(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)zirconium dichloride;rac-dimethylsilyl-(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)(2-isoprpyl-4-(4′-tert-butyl-phenyl)-indenyl)hafnium dimethyl;rac-dimethylsilyl-(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)(2-isoprpyl-4-(4′-tert-butyl-phenyl)-indenyl)hafnium dichloride;rac-dimethylsilyl-(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)(2-isoprpyl-4-(4′-tert-butyl-phenyl)-indenyl)zirconium dichloride;rac-dimethylsilyl-(2-methyl-4-(4′-tert-butyl-phenyl)-indenyl)(2-isopropyl-4-(4′-tert-butyl-phenyl)-indenyl)zirconiumdimethyl;rac-dimethylsilyl-bis(2-methyl-4,6-diisopropyl-indenyl) hafniumdimethyl; rac-dimethylsilyl-bis(2-methyl-4,6-diisopropyl-indenyl)zirconium dimethyl;rac-dimethylsilyl-bis(2-methyl-4,6-diisopropyl-indenyl) zirconiumdichloride; and rac-dimethylsilyl-bis(2-methyl-4,6-diisopropyl-indenyl)hafnium dichloride.